GitHub actions

.github/workflows/build-and-push.yaml

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+---
+name: Build and Push Docker Container
+
+on: 
+  workflow_dispatch:
+  pull_request: 
+    branches: [ $default_branch ]
+  push:
+
+env:
+  github_runner: ubuntu-latest
+  container_name: gh-cli
+  docker_file: ubuntu20.Dockerfile
+  docker_tags: ghcr.io/gunnarwustl/gh-cli:ubuntu20
+
+jobs: 
+  diff_check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Diff Check
+        uses: ./.github/workflows/steps/diff-check.yaml
+        with:
+          container_name: ${{ env.container_name }}
+          docker_file: ${{ env.docker_file }}
+
+  build_push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Build and Push
+        uses: ./.github/workflows/steps/docker-build.yaml
+        with: 
+          push_image_bool: true

.github/workflows/steps/diff-check.yaml

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+---
+name: Diff Check
+
+jobs:
+  diff_check:
+    runs-on: ubuntu-latest
+    outputs:
+      ${{ container_name }}: ${{ steps.filter.outputs.${{ container_name }} }}
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v3
+
+      - name: Examine Paths and Files
+        uses: dorny/paths-filter@v2
+        id: filter
+        with: 
+          filters: |
+            ${{ container_name }}:
+              - ${{ docker_file }}

.github/workflows/steps/docker-build.yaml

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+---
+name: Build ${{ container_name }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v3
+
+      - name: Container Repository Login
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Setup BuildKit 
+        uses: docker/setup-buildx-action@v2
+
+      - name: Build and Push Container
+        uses: docker/build-push-action@v3
+        with: 
+          file: ${{ docker_file }}
+          tags: ${{ docker_tags }}
+          push: ${{ push_image_bool }}