hotfix pipeline build step

Author: Andre Anundsson (Xenit)

.github/workflows/container-build-template.yml

@@ -25,6 +25,11 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
+      - name: Convert Repository Name to Lowercase
+        id: repository_to_lower_case
+        run: |
+          echo "repo_lower=$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
+
       - name: Login to GitHub Container Registry
         if: ${{ inputs.push }}
         uses: docker/login-action@v3
@@ -37,17 +42,17 @@ jobs:
         id: build-push
         uses: docker/build-push-action@v6
         with:
-          cache-from: "ghcr.io/${{ github.repository }}/tools:latest"
+          cache-from: "ghcr.io/${{ steps.repository_to_lower_case.outputs.repo_lower }}/tools:latest"
           file: docker/Dockerfile
           context: docker
-          tags: "ghcr.io/${{ github.repository_owner }}/${{ github.repository }}/tools:${{ inputs.tag }}"
+          tags: "ghcr.io/${{ steps.repository_to_lower_case.outputs.repo_lower }}/tools:${{ inputs.tag }}"
           platforms: ${{ inputs.platforms }}
           push: ${{ inputs.push }}
 
       - name: Generate Artifact Attestation
         if: ${{ inputs.push }}
         uses: actions/attest-build-provenance@v2
         with:
-          subject-name: ghcr.io/${{ github.repository }}
+          subject-name: ghcr.io/${{ steps.repository_to_lower_case.outputs.repo_lower }}
           subject-digest: ${{ steps.build-push.outputs.digest }}
           push-to-registry: true