add docker build/no-push action

.github/workflows/build_docker.yml

@@ -0,0 +1,55 @@
+# action to build the Docker image at each commit without pushing it
+name: build Docker image
+
+on:
+  pull_request:
+    branches:
+      - 'master'
+  push:
+    branches:
+      - 'master'
+    tags:
+      - "v*.*.*"
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - 
+        name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ghcr.io/${{ github.repository_owner }}/mesocircuit_model     
+          tags: |
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+            type=sha
+            type=raw,value=latest,enable={{is_default_branch}}
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - 
+        name: Login to GitHub Container Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}      
+      -
+        name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: "{{defaultContext}}:docker"
+          push: False
+          tags: ${{ steps.meta.outputs.tags }}
+          file:
+            ./Dockerfile
+          platforms:
+            linux/amd64
+            linux/arm64