ci: make it work for forks too

.github/actions/build-test-push/action.yml

@@ -48,6 +48,7 @@ runs:
       uses: actions/checkout@v4
 
     - name: Log in to Docker Hub
+      if: inputs.docker_hub_username != ''
       uses: docker/login-action@v3
       with:
         username: ${{ inputs.docker_hub_username }}
@@ -64,7 +65,7 @@ runs:
           --dry-run "${{ inputs.dry_run }}"
 
     - name: Run integration tests
-      if: ${{ inputs.skip_integrations_tests != 'true' }}
+      if: inputs.skip_integrations_tests != 'true'
       shell: bash
       run: |
         .github/actions/build-test-push/test.sh \
@@ -74,6 +75,7 @@ runs:
           --dry-run "${{ inputs.dry_run }}"
 
     - name: Push
+      if: inputs.docker_hub_username != ''
       shell: bash
       run: |
         .github/actions/build-test-push/push.sh \

.github/workflows/continuous-integration.yml

@@ -161,12 +161,29 @@ jobs:
           platform: linux/arm/v7
           alternate_repository: snapshot
 
-  merge_clean_snapshot_tags:
+  merge_clean_snapshot_guard:
     needs:
       - snapshot_amd64
       - snapshot_386
       - snapshot_arm64
       - snapshot_arm_v7
+    name: Secrets access check
+    runs-on: ubuntu-latest
+    outputs:
+      continue: ${{ steps.check.outputs.continue }}
+    steps:
+      - name: Check
+        id: check
+        run: |
+          if [ -n "${{ secrets.DOCKERHUB_USERNAME }}" ]; then
+            echo "continue=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "continue=false" >> "$GITHUB_OUTPUT"
+          fi
+
+  merge_clean_snapshot_tags:
+    if: needs.merge_clean_snapshot_guard.outputs.continue == 'true'
+    needs: merge_clean_snapshot_guard
     name: Merge and clean snapshot tags
     runs-on: ubuntu-latest
     steps:

.github/workflows/pull-request-cleanup.yml

@@ -11,6 +11,7 @@ jobs:
   cleanup:
     name: Cleanup Docker images
     runs-on: ubuntu-latest
+    continue-on-error: true
     steps:
       - name: Check out code
         uses: actions/checkout@v4