fix: do not use build-push-action and buildx

.forgejo/workflows/build.yaml

@@ -25,13 +25,11 @@ jobs:
           registry: code.bcarlin.net
           username: ${{ github.actor }}
           password: ${{ github.token }}
-      -
-        name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-      -
-        name: Build and push
-        uses: docker/build-push-action@v6
-        with:
-          push: true
-          pull: true
-          tags: code.bcarlin.net/oci/browsers:latest
+
+      - name: Build image
+        run: |
+          docker build -t code.bcarlin.net/oci/browsers:latest .
+
+      - name: Push image
+        run: |
+          docker push code.bcarlin.net/oci/browsers:latest