Add build action

.github/build.yml

@@ -0,0 +1,30 @@
+name: build
+
+on:
+  push:
+    branches: [ main ]
+    # Run when container or environment is changed
+    paths:
+        - 'jukes-micromamba/Dockerfile'
+  # Allows workflow to be manually triggered
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: 'Checkout'
+        uses: actions/checkout@main
+
+      - name: 'Login to GitHub Container Registry'
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{github.actor}}
+          password: ${{secrets.GITHUB_TOKEN}}
+
+      - name: 'Build Inventory Image'
+        run: |
+          docker build . --tag ghcr.io/bsurc/jukes-micromamba:latest
+          docker push ghcr.io/bsurc/jukes-micromamba:latest