ci: only attempt to push sidecar image from canonical repository

Signed-off-by: Jacob Howard <[email protected]>

Author: xenoscopic

.github/workflows/ci.yml

@@ -131,7 +131,7 @@ jobs:
       - uses: docker/setup-qemu-action@v3
       - uses: docker/setup-buildx-action@v3
       - uses: docker/login-action@v3
-        if: github.ref_type == 'tag'
+        if: github.ref_type == 'tag' && github.action_repository == 'mutagen-io/mutagen'
         with:
           username: ${{ secrets.SIDECAR_DEPLOYMENT_USER }}
           password: ${{ secrets.SIDECAR_DEPLOYMENT_TOKEN }}
@@ -143,7 +143,7 @@ jobs:
           file: images/sidecar/linux/Dockerfile
           target: mit
           tags: ${{ steps.tag.outputs.tag }}
-          push: ${{ github.ref_type == 'tag' }}
+          push: ${{ github.ref_type == 'tag' && github.action_repository == 'mutagen-io/mutagen' }}
           platforms: |
             linux/386
             linux/amd64
@@ -156,7 +156,7 @@ jobs:
           file: images/sidecar/linux/Dockerfile
           target: sspl
           tags: ${{ steps.tag.outputs.tag }}-sspl
-          push: ${{ github.ref_type == 'tag' }}
+          push: ${{ github.ref_type == 'tag' && github.action_repository == 'mutagen-io/mutagen' }}
           platforms: |
             linux/386
             linux/amd64