Switch to runner based authentication

.github/workflows/main.yml

@@ -12,6 +12,9 @@ on:
 jobs:
   bake:
     runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
     steps:
       - name: Checkout
         uses: actions/checkout@v2.3.4
@@ -30,8 +33,8 @@ jobs:
         uses: docker/login-action@v1.10.0
         with:
           registry: ghcr.io
-          username: pykmsorgadmin
-          password: ${{ secrets.GHCR_PASSWORD }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build
         uses: docker/build-push-action@v2
         with: