Add GitHub Action to ensure that docker images build as expected. (#80)

.github/workflows/main.yml

@@ -0,0 +1,33 @@
+name: Docker CI
+
+on: [push, pull_request]
+
+jobs:
+  apiary-docker-image:
+    name: Apiary Docker Image Checks
+    runs-on: ubuntu-18.04
+    steps:
+    - name: Check out code  
+      uses: actions/checkout@v2
+
+    - name: Ensure Apiary Docker Image Builds.
+      uses: docker/[email protected]
+      with:
+        dockerfile: "Dockerfile"
+        always_pull: true
+        push: false
+
+  apiary-init-docker-image:
+    name: Apiary Init Container Docker Checks
+    runs-on: ubuntu-18.04
+    steps:
+    - name: Check out code  
+      uses: actions/checkout@v2
+
+    - name: Ensure Apiary Init Docker Image Builds.
+      uses: docker/[email protected]
+      with:
+        path: "initContainer"
+        dockerfile: "initContainer/Dockerfile"
+        always_pull: true
+        push: false