feat(ci): use go.mod to determine Go version in CI

Author: aymanbagabas

.github/workflows/build.yml

@@ -10,14 +10,19 @@ jobs:
   build:
     strategy:
       matrix:
-        go-version: ["^1", "stable", "oldstable"]
+        go-version: ["^1", "stable", "oldstable", "gomod"]
         os: [ubuntu-latest, macos-latest] #windows-latest
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v6
       - uses: actions/setup-go@v6
+        if: matrix.go-version != 'gomod'
         with:
           go-version: ${{ matrix.go-version }}
+      - uses: actions/setup-go@v6
+        if: matrix.go-version == 'gomod'
+        with:
+          go-version-file: go.mod
       - run: |
           diff --version
           patch --version