build pipeline

.github/workflows/main.yml

@@ -0,0 +1,21 @@
+name: Build container image
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Build container image
+        run: docker build -t altserver:latest .