Add Go version matrix and linting to CI workflow

Updated the GitHub Actions workflow to test against Go versions 1.20, 1.21, and 1.22, and added golangci-lint for code linting. Also added a CI status badge to the README.

Author: rojcode

.github/workflows/go.yml

@@ -5,24 +5,31 @@ name: Go
 
 on:
   push:
-    branches: [ "main" ]
+    branches: ["main"]
   pull_request:
-    branches: [ "main" ]
+    branches: ["main"]
 
 jobs:
-
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go-version: ["1.20", "1.21", "1.22"]
     steps:
-    - uses: actions/checkout@v4
+      - uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ matrix.go-version }}
 
-    - name: Set up Go
-      uses: actions/setup-go@v4
-      with:
-        go-version: '1.20'
+      - name: Build
+        run: go build -v ./...
 
-    - name: Build
-      run: go build -v ./...
+      - name: Lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          version: v1.55
 
-    - name: Test
-      run: go test -v ./...
+      - name: Test
+        run: go test -v ./...

README.md

@@ -1,5 +1,7 @@
 # kurdical
 
+[![Go](https://github.com/rojcode/kurdical/actions/workflows/go.yml/badge.svg)](https://github.com/rojcode/kurdical/actions/workflows/go.yml)
+
 ## About the Kurdish Calendar
 
 The Kurdish calendar is an independent solar calendar system with historical offsets aligned to significant events in Kurdish history.