implement an edge tag and update image security check accordingly

python:3.14-slim has no Node.js so actions/checkout@v4 fails with
'node: executable file not found in PATH'. Switch to the same
gitea_runner_python314 custom image used by python-checks.yml which
has both Python 3.14 and Node.js. Drop the python_version input as it
no longer drives the container selection.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/docker-publish.yml

@@ -9,6 +9,15 @@ on:
       dockerfile_path:
         type: string
         default: "."
+      floating_tag:
+        type: string
+        default: "edge"
+      run_image_scan:
+        type: boolean
+        default: true
+      scan_severity:
+        type: string
+        default: "HIGH,CRITICAL"
     secrets:
       REGISTRY_USERNAME: { required: true }
       REGISTRY_PASSWORD: { required: true }
@@ -62,6 +71,11 @@ jobs:
             -t "${FULL_IMAGE}:${SHA_SHORT}" \
             ${{ inputs.dockerfile_path }}
 
+          # Floating tag points at the most recent build on any branch/tag, so
+          # the nightly image-security scan always has a stable target even
+          # before a release exists. ":latest" stays release-only (below).
+          docker tag "${FULL_IMAGE}:${SHA_SHORT}" "${FULL_IMAGE}:${{ inputs.floating_tag }}"
+
           if echo "${{ gitea.ref }}" | grep -q '^refs/tags/v'; then
             VERSION="${{ gitea.ref_name }}"
             VERSION="${VERSION#v}"
@@ -74,6 +88,38 @@ jobs:
             docker tag "${FULL_IMAGE}:${SHA_SHORT}" "${FULL_IMAGE}:${MAJOR}"
           fi
 
+      - name: Image Vulnerability Scan
+        if: ${{ inputs.run_image_scan }}
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          # Fallback for runner images without Trivy baked in. Pinned version +
+          # checksum, never "latest": Trivy releases were compromised in the
+          # March 2026 supply-chain incident (malicious v0.69.4). Keep in sync
+          # with the ARGs in the PipelineImage Dockerfiles.
+          TRIVY_VERSION=0.71.0
+          TRIVY_SHA256=30a3d22b23f88c233f1658f562fb477cae3b3e8b4761109d515b7698daf85814
+          if ! command -v trivy >/dev/null 2>&1; then
+            echo "=== Trivy not in runner image, installing v${TRIVY_VERSION} ==="
+            curl -sSfLO "https://github.com/aquasecurity/trivy/releases/download/v${TRIVY_VERSION}/trivy_${TRIVY_VERSION}_Linux-64bit.tar.gz"
+            echo "${TRIVY_SHA256}  trivy_${TRIVY_VERSION}_Linux-64bit.tar.gz" | sha256sum -c -
+            tar -xzf "trivy_${TRIVY_VERSION}_Linux-64bit.tar.gz" -C /usr/local/bin trivy
+            rm "trivy_${TRIVY_VERSION}_Linux-64bit.tar.gz"
+          fi
+          trivy --version
+
+          SHA_SHORT="$(git rev-parse --short HEAD)"
+          FULL_IMAGE="${{ secrets.DOCKER_REGISTRY }}/${{ inputs.image_name }}"
+
+          echo "=== Scanning ${FULL_IMAGE}:${SHA_SHORT} (fail on fixable ${{ inputs.scan_severity }}) ==="
+          trivy image \
+            --exit-code 1 \
+            --severity "${{ inputs.scan_severity }}" \
+            --ignore-unfixed \
+            --scanners vuln,secret \
+            "${FULL_IMAGE}:${SHA_SHORT}"
+
       - name: Push image
         shell: bash
         run: |
@@ -105,6 +151,9 @@ jobs:
           echo "=== Push SHA tag ==="
           docker push "${FULL_IMAGE}:${SHA_SHORT}"
 
+          echo "=== Push floating tag (${{ inputs.floating_tag }}) ==="
+          docker push "${FULL_IMAGE}:${{ inputs.floating_tag }}"
+
           if echo "${{ gitea.ref }}" | grep -q '^refs/tags/v'; then
             echo "=== Version tag detected ==="
 

.gitea/workflows/image-security-checks.yml

@@ -0,0 +1,70 @@
+name: Reusable Image Security Checks
+
+on:
+  workflow_call:
+    inputs:
+      image_name:
+        required: true
+        type: string
+      image_tag:
+        type: string
+        default: "edge"
+      scan_severity:
+        type: string
+        default: "HIGH,CRITICAL"
+    secrets:
+      REGISTRY_USERNAME: { required: true }
+      REGISTRY_PASSWORD: { required: true }
+      DOCKER_REGISTRY: { required: true }
+
+jobs:
+  scan:
+    runs-on: docker
+    container:
+      image: gitea.tech-buddy.at/bitbuddydev/gitea_runner_python314:dev-bda315b82bb23d83065b77d91fedf0e20d9accf1
+      credentials:
+        username: ${{ secrets.REGISTRY_USERNAME }}
+        password: ${{ secrets.REGISTRY_PASSWORD }}
+
+    steps:
+      - name: Docker Login
+        run: |
+          echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login "${{ secrets.DOCKER_REGISTRY }}" -u "${{ secrets.REGISTRY_USERNAME }}" --password-stdin
+
+      - name: Pull Image
+        shell: bash
+        run: |
+          set -euo pipefail
+          FULL_IMAGE="${{ secrets.DOCKER_REGISTRY }}/${{ inputs.image_name }}:${{ inputs.image_tag }}"
+          echo "=== Pulling ${FULL_IMAGE} ==="
+          docker pull "${FULL_IMAGE}"
+
+      - name: Image Vulnerability Scan
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          # Fallback for runner images without Trivy baked in. Pinned version +
+          # checksum, never "latest": Trivy releases were compromised in the
+          # March 2026 supply-chain incident (malicious v0.69.4). Keep in sync
+          # with the ARGs in the PipelineImage Dockerfiles.
+          TRIVY_VERSION=0.71.0
+          TRIVY_SHA256=30a3d22b23f88c233f1658f562fb477cae3b3e8b4761109d515b7698daf85814
+          if ! command -v trivy >/dev/null 2>&1; then
+            echo "=== Trivy not in runner image, installing v${TRIVY_VERSION} ==="
+            curl -sSfLO "https://github.com/aquasecurity/trivy/releases/download/v${TRIVY_VERSION}/trivy_${TRIVY_VERSION}_Linux-64bit.tar.gz"
+            echo "${TRIVY_SHA256}  trivy_${TRIVY_VERSION}_Linux-64bit.tar.gz" | sha256sum -c -
+            tar -xzf "trivy_${TRIVY_VERSION}_Linux-64bit.tar.gz" -C /usr/local/bin trivy
+            rm "trivy_${TRIVY_VERSION}_Linux-64bit.tar.gz"
+          fi
+          trivy --version
+
+          FULL_IMAGE="${{ secrets.DOCKER_REGISTRY }}/${{ inputs.image_name }}:${{ inputs.image_tag }}"
+
+          echo "=== Scanning ${FULL_IMAGE} (fail on fixable ${{ inputs.scan_severity }}) ==="
+          trivy image \
+            --exit-code 1 \
+            --severity "${{ inputs.scan_severity }}" \
+            --ignore-unfixed \
+            --scanners vuln,secret \
+            "${FULL_IMAGE}"

.gitea/workflows/python-security-checks.yml

@@ -0,0 +1,38 @@
+name: Reusable Python Security Checks
+
+on:
+  workflow_call:
+    inputs:
+      install_command:
+        type: string
+        default: 'python -m pip install "bandit[toml]"'
+      security_command:
+        type: string
+        default: "python -m bandit -r app -c pyproject.toml"
+      working_directory:
+        type: string
+        default: "."
+    secrets:
+      REGISTRY_USERNAME: { required: true }
+      REGISTRY_PASSWORD: { required: true }
+
+jobs:
+  security:
+    runs-on: docker
+    container:
+      image: gitea.tech-buddy.at/bitbuddydev/gitea_runner_python314:dev-bda315b82bb23d83065b77d91fedf0e20d9accf1
+      credentials:
+        username: ${{ secrets.REGISTRY_USERNAME }}
+        password: ${{ secrets.REGISTRY_PASSWORD }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install security tools
+        working-directory: ${{ inputs.working_directory }}
+        run: ${{ inputs.install_command }}
+
+      - name: Run security scan
+        working-directory: ${{ inputs.working_directory }}
+        run: ${{ inputs.security_command }}