Update deploy_to_ghcr_custom_tag.yaml

Author: martedesco

.github/workflows/deploy_to_ghcr_custom_tag.yaml

@@ -17,6 +17,8 @@ jobs:
     steps:
       - name: Checkout GitHub Action
         uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.inputs.tag }}
 
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
@@ -33,4 +35,4 @@ jobs:
           docker build --label "org.opencontainers.image.title=copilot-metrics-viewer" --label "org.opencontainers.image.description=Metrics viewer for GitHub Copilot usage" --label "org.opencontainers.image.source=$GITHUB_REPO" -t ghcr.io/$GITHUB_REPO:$TAG .
           docker push ghcr.io/$GITHUB_REPO:$TAG
         env:
-          GITHUB_REPO: ${{ github.repository }}
+          GITHUB_REPO: ${{ github.repository }}