Adding github actions build script.

.github/workflows/master.yml

@@ -0,0 +1,21 @@
+name: Main
+
+on:
+  push:
+    paths-ignore:
+    - '*.md'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Build Docker image
+        id: build
+        run: docker build . -t dvfdocker/owlcms4:latest
+        shell: bash
+  test:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3