ci(forgejo): configure act-runner container image and registry host

.forgejo/workflows/build-push.yml

@@ -9,19 +9,11 @@ on:
     tags:
       - 'v*'
 
-# Grant permissions to push packages to Forgejo Container Registry and create releases
-permissions:
-  contents: write
-  packages: write
-
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
     container:
       image: catthehacker/ubuntu:act-latest
-    permissions:
-      contents: write
-      packages: write
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v4
@@ -70,8 +62,6 @@ jobs:
     runs-on: ubuntu-latest
     container:
       image: catthehacker/ubuntu:act-latest
-    permissions:
-      contents: write
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v4