added action

added action so that when a containerfile is added/changed said containerfile will get built and pushed to scm

.github/workflows/build.yml

@@ -0,0 +1,39 @@
+name: Docker Build and Publish
+
+on:
+  push:
+    paths:
+      - "**/Dockerfile"
+
+jobs:
+  build_and_publish:
+    name: Build and Publish Docker Image
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Get Dockerfile image name
+        id: get_image_name
+        run: |
+          IMAGE_NAME=$(grep -Po '(?<=name=")[^"]*' Dockerfile)
+          echo "::set-output name=image_name::$IMAGE_NAME"
+
+      - name: Login to container registry
+        run: docker login -u ${{ secrets.REGISTRY_USERNAME }} -p ${{ secrets.REGISTRY_PASSWORD }} scm.wyattjmiller.com
+
+      - name: Check for Dockerfile changes
+        id: dockerfile_changed
+        run: |
+          if git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep '^Dockerfile$'; then
+            echo "::set-output name=changed::true"
+          else
+            echo "::set-output name=changed::false"
+          fi
+
+      - name: Build and Publish Docker image
+        if: steps.dockerfile_changed.outputs.changed == 'true'
+        run: |
+          docker build -t scm.wyattjmiller.com/${{ steps.get_image_name.outputs.image_name }}:${{ github.sha }} .
+          docker push scm.wyattjmiller.com/${{ steps.get_image_name.outputs.image_name }}:${{ github.sha }}