ci: call buildah bud directly

.forgejo/workflows/build-image.yml

@@ -9,17 +9,12 @@ jobs:
     runs-on: ubuntu-latest-amd64
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install Buildah
         run: apt-get -y update && apt-get -y install buildah
 
-      - name: Buildah Action
-        uses: https://github.com/redhat-actions/buildah-build@v2
-        with:
-          image: weewx
-          tags: master
-          containerfiles: |
-            ./Dockerfile
-          extra-args: |
-            --storage-driver=vfs
+      - name: Build Container
+        run: |
+          export BUILDAH_ISOLATION=chroot
+          buildah --storage-driver=vfs bud -f ./Dockerfile .