chore: add testing to workflow

.github/workflows/docker.yml

@@ -9,11 +9,31 @@
 
 name: Publish Docker image
 
-on: workflow_dispatch
+on:   
+  push:
+    branches: [main]
 
 jobs:
+  test:
+    name: Go Test
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version-file: go.mod
+
+    - name: Build
+      run: go build -v ./...
+
+    - name: Test
+      uses: robherley/go-test-action@v0
+
   push_to_registry:
     name: Push Docker image to Docker Hub
+    needs: test
     runs-on: ubuntu-latest
     permissions:
       packages: write