Fix deprecated Github Actions output usage

Author: jennydaman

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Get git tag
         id: git_info
         if: startsWith(github.ref, 'refs/tags/')
-        run: echo "::set-output name=tag::${GITHUB_REF##*/}"
+        run: echo "tag=${GITHUB_REF##*/}" >> $GITHUB_OUTPUT
       - name: Determine image tags
         id: determine
         env:
@@ -43,9 +43,9 @@ jobs:
             tag="${tag:1}"
           fi
 
-          echo "::set-output name=repo::$repo"
-          echo "::set-output name=tag::$tag"
-          echo "::set-output name=dock_image::$repo:$tag"
+          dock_image=$repo:$tag
+          echo $dock_image
+          echo "dock_image=$dock_image" >> $GITHUB_OUTPUT
       - uses: actions/checkout@v3
       - uses: docker/setup-qemu-action@v2
       - uses: docker/setup-buildx-action@v2