WIP - add build_images workflow

Author: solnic

.github/workflows/build_images.yml

@@ -0,0 +1,29 @@
+name: "Build & push devcontainer"
+
+on:
+  push:
+    paths:
+      - .devcontainer/**
+      - .github/workflows/build_images.yml
+
+permissions:
+  contents: read
+  packages: write # Required for GHCR
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out current commit
+        uses: actions/checkout@v4
+
+      - name: Build and devcontainer build image
+        uses: getsentry/action-build-and-push-images@main
+        with:
+          ghcr_image_name: 'sentry-ruby-devcontainer-build'
+          dockerfile_path: '.devcontainer/Dockerfile'
+          ghcr: true
+
+      - name: Use outputs
+        run: |
+          echo "GHCR URL: ${{ steps.build.outputs.ghcr_image_url }}"