Authenticate to ghcr.io/appscode with GitHub App token

Signed-off-by: Tamal Saha <tamal@appscode.com>

Author: tamalsaha

.github/workflows/release.yml

@@ -57,14 +57,25 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3.12.0
 
+      - uses: actions/create-github-app-token@1b10c78c7865c340bc4f6099eb2f838309f1e8c3 # v3
+        id: app-token
+        with:
+          client-id: ${{ secrets.GHCRX_APP_CLIENT_ID }}
+          private-key: ${{ secrets.GHCRX_APP_PRIVATE_KEY }}
+          owner: appscode
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121 # v4.1.0
+        with:
+          registry: ghcr.io
+          username: ${{ steps.app-token.outputs.app-slug }}[bot]
+          password: ${{ steps.app-token.outputs.token }}
+
       - name: Publish to GitHub Container Registry
         env:
           REGISTRY: ghcr.io/appscode
-          DOCKER_TOKEN: ${{ secrets.LGTM_GITHUB_TOKEN }}
-          USERNAME: 1gtm
           APPSCODE_ENV: prod
         run: |
-          docker login ghcr.io --username ${USERNAME} --password ${DOCKER_TOKEN}
           make release COMPRESS=yes
 
 #      - name: Publish to Red Hat Ecosystem Catalog