Create docker-image.yml

Create ci workflow that builds container on push, pr and once per week. Scheduled trigger added because to get alerts if changes in dependencies cause issues with container build.

Author: nakytoe

.github/workflows/docker-image.yml

@@ -0,0 +1,20 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+  schedule:
+    - cron: "0 3 * * 0"
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Build the Docker image
+      run: docker compose build