* Github Actions: generating package version and

  Docker image metadata has been moved to separate jobs,
  since those don't need to be matrix ones

.github/workflows/main.yml

@@ -11,6 +11,25 @@ on:
       - master
 
 jobs:
+  version:
+    name: Generate package version
+    runs-on: ubuntu-latest
+    outputs:
+      value: ${{ steps.package-version.outputs.value }}
+    steps:
+      - name: Checkout the code
+        uses: actions/checkout@v4
+      - name: Set Python up
+        uses: actions/setup-python@v5
+      - name: Install dependencies
+        run: >-
+          python -m pip install --upgrade setuptools_scm
+      - name: Determine package version
+        id: package-version
+        run: |
+          package_version=`python -m setuptools_scm --format plain`
+          echo "value=$package_version" >> $GITHUB_OUTPUT
+
   tests:
     name: Tests
     strategy:
@@ -33,8 +52,7 @@ jobs:
             python: '3.12'
             toxenv: py
     runs-on: ${{ matrix.os }}
-    outputs:
-      version: ${{ steps.package-version.outputs.VALUE }}
+    needs: [version]
     steps:
       - name: Checkout the code
         uses: actions/checkout@v4
@@ -54,11 +72,6 @@ jobs:
         run: tox -e ${{ matrix.toxenv }}
       - name: Generage Coverage combined XML report
         run: coverage xml
-      - name: Determine package version
-        id: package-version
-        run: |
-          package_version=`python -m setuptools_scm --format plain`
-          echo "VALUE=$package_version" >> $GITHUB_OUTPUT
       - name: SonarCloud scanning
         uses: sonarsource/sonarcloud-github-action@master
         env:
@@ -69,9 +82,35 @@ jobs:
           args: >-
             -Dsonar.projectKey=${{ github.repository_owner }}_${{ github.event.repository.name }}
             -Dsonar.organization=${{ github.repository_owner }}
-            -Dsonar.projectVersion=${{ steps.package-version.outputs.VALUE }}
+            -Dsonar.projectVersion=${{ needs.version.outputs.value }}
           # yamllint enable rule:line-length
 
+  docker-metadata:
+    name: Generata metadata for container images
+    runs-on: ubuntu-latest
+    needs: [version]
+    outputs:
+      version: ${{ steps.meta.outputs.version }}
+      labels: ${{ steps.meta.outputs.labels }}
+      annotations_json: ${{ toJson(fromJson(steps.meta.outputs.json).annotations) }}
+      tags_json: ${{ toJson(fromJson(steps.meta.outputs.json).tags) }}
+    steps:
+      - name: Prepare Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=pep440,pattern={{raw}},value=${{ needs.version.outputs.value }}
+            type=raw,value=latest,enable=${{
+              github.event_name == 'release'
+              && github.event.action == 'published'
+              && (github.event.release.target_commitish == 'main'
+              || github.event.release.target_commitish == 'master')
+            }}
+            type=ref,event=pr
+            type=edge
+
   docker-publish:
     name: Build and publish Docker images
     strategy:
@@ -87,7 +126,7 @@ jobs:
           - platform_id: linux/amd64
             platform_name: linux-amd64
     runs-on: ubuntu-latest
-    needs: [tests]
+    needs: [version, tests, docker-metadata]
     permissions:
       contents: read
       packages: write
@@ -101,22 +140,6 @@ jobs:
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
 
-    - name: Prepare Docker metadata
-      id: meta
-      uses: docker/metadata-action@v5
-      with:
-        images: ghcr.io/${{ github.repository }}
-        tags: |
-          type=pep440,pattern={{raw}},value=${{ needs.tests.outputs.version }}
-          type=raw,value=latest,enable=${{
-            github.event_name == 'release'
-            && github.event.action == 'published'
-            && (github.event.release.target_commitish == 'main'
-            || github.event.release.target_commitish == 'master')
-          }}
-          type=ref,event=pr
-          type=edge
-
     - name: Login to GitHub Container Registry
       uses: docker/login-action@v3
       with:
@@ -133,11 +156,11 @@ jobs:
         # See https://github.com/docker/build-push-action/issues/286 for more
         # details
         platforms: ${{ matrix.platform_id }}
-        labels: ${{ steps.meta.outputs.labels }}
+        labels: ${{ needs.docker-metadata.outputs.labels }}
         # Implicit context points to working copy, not Git respository, so
         # `setuptools_scm` needs to receive the version explicitly
         build-args: |
-          VERSION=${{ needs.tests.outputs.version }}
+          VERSION=${{ needs.version.outputs.value }}
         # Push by digest only, manifest will be added later
         outputs: >-
           type=image,name=ghcr.io/${{ github.repository }},push-by-digest=true,name-canonical=true,push=true
@@ -157,15 +180,12 @@ jobs:
         matrix-step-name: ${{ github.job }}
         matrix-key: ${{ matrix.platform_name }}
         outputs: |-
-          image_version: ${{ steps.meta.outputs.version }}
-          image_annotations: ${{ toJson(fromJson(steps.meta.outputs.json).annotations) }}
-          image_tags: ${{ toJson(fromJson(steps.meta.outputs.json).tags) }}
           image_digest: ${{ steps.build.outputs.digest }}
 
   docker-manifest:
     name: Create and push Docker manifest
     runs-on: ubuntu-latest
-    needs: [docker-publish]
+    needs: [docker-metadata, docker-publish]
     steps:
       - name: Read image information from publish job
         uses: GoCodeAlone/github-action-matrix-outputs-read@v1
@@ -179,14 +199,14 @@ jobs:
       - name: Create and push Docker manifest
         run: >-
           docker buildx imagetools create
-          --annotation ${{ fromJson(fromJson(steps.read.outputs.result).image_annotations)[0] }}
-          ${{ join(fromJson(fromJson(steps.read.outputs.result).image_tags)[0], '--tags') }}
-          ${{ join(fromJson(fromJson(steps.read.outputs.result).image_digest), ' ') }}
+          ${{ join(fromJson(needs.docker-metadata.outputs.annotations_json), '--annotation ') }}
+          ${{ join(fromJson(needs.docker-metadata.outputs.tags_json), '--tags ') }}
+          ${{ join(fromJson(fromJson(steps.read.outputs.result).image_digest.*), ' ') }}
 
   docker-test:
     name: Test Docker images
     runs-on: ubuntu-latest
-    needs: [docker-manifest]
+    needs: [docker-metadata, docker-manifest]
     strategy:
       fail-fast: false
       matrix:
@@ -215,5 +235,5 @@ jobs:
         run: >-
           docker run --rm
           --platform ${{ matrix.platform_id }}
-          ghcr.io/${{ github.repository }}:${{ fromJson(steps.read.outputs.result).image_version[0] }}
+          ghcr.io/${{ github.repository }}:${{ needs.docker-metadata.outputs.version }}
           --help