Update docker/build-push-action action to v7 (#250)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/docker.yml

@@ -26,14 +26,14 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Push image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: true
           tags: |
             ghcr.io/${{ github.repository }}:${{ github.sha }}
       - name: Tag & Push branch image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: true
@@ -42,7 +42,7 @@ jobs:
             ghcr.io/${{ github.repository }}:${{ github.ref_name }}
       - name: Tag & Push latest image
         if: github.ref_name == 'main'
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: true