CI: add github CI jobs

Author: ziggie1984

.github/workflows/main.yml

@@ -0,0 +1,78 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: '1.24.6'
+
+    - name: Check formatting
+      run: make fmt-check
+
+    - name: Run linter
+      run: make lint
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: '1.24.6'
+
+    - name: Build
+      run: make build
+
+    - name: Build sphinx-cli
+      run: make sphinx-cli
+
+  unit-tests:
+    name: Unit Tests
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        unit_type:
+          - unit
+          - unit-cover
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: '1.24.6'
+
+    - name: Run unit tests
+      run: make ${{ matrix.unit_type }}
+
+    - name: Send coverage
+      uses: coverallsapp/github-action@v2
+      if: matrix.unit_type == 'unit-cover'
+      continue-on-error: true
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}
+        file: coverage.txt
+        format: golang