change: use the default ephemeral GITHUB_TOKEN instead of the static GHCR_TOKEN

Signed-off-by: Łukasz Piątkowski <piontec@gmail.com>

.github/workflows/release.yaml

@@ -2,7 +2,7 @@ name: release
 
 on:
   push:
-    tags: [ 'v*' ]
+    tags: ["v*"]
 
 permissions:
   contents: read
@@ -44,7 +44,7 @@ jobs:
         with:
           registry: ghcr.io
           username: fluxcdbot
-          password: ${{ secrets.GHCR_TOKEN }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Login to Docker Hub
         uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567 # v3.3.0
         with:
@@ -125,7 +125,7 @@ jobs:
         with:
           registry: ghcr.io
           username: fluxcdbot
-          password: ${{ secrets.GHCR_TOKEN }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Login to DockerHub
         uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567 # v3.3.0
         with:
@@ -208,4 +208,4 @@ jobs:
       digest: ${{ needs.release-flux-cli.outputs.image_digest }}
       registry-username: fluxcdbot
     secrets:
-      registry-password: ${{ secrets.GHCR_TOKEN }}
+      registry-password: ${{ secrets.GITHUB_TOKEN }}