Add QEMU and Docker Buildx setup actions

Author: npv2k1

.github/workflows/build-dev-container.yaml

@@ -32,7 +32,13 @@ jobs:
         dir: ${{fromJson(needs.list-dir.outputs.dir)}} 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4      
+        uses: actions/checkout@v4  
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226
 
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v2 

templates/universal/.devcontainer/Dockerfile

@@ -6,5 +6,5 @@ RUN chsh -s /usr/bin/fish
 # install oh-my-fish
 RUN curl -L https://get.oh-my.fish | fish
 
-RUN omf theme agnoster
-
+# reload fish shell
+RUN fish -c "omf install agnoster"