Simplify workflow settings and upgrade setup-go to v4

This commit simplifies the Forgejo workflow settings by hardcoding the 'docker' and '1.22' options for the 'runs-on' and 'go-version' respectively, instead of using a matrix. The version of setup-go action is also upgraded to v4.

.forgejo/workflows/codecov.yml

@@ -24,23 +24,19 @@ env:
   API_KEY: ${{ secrets.API_KEY }}
 jobs:
   run:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [docker]
-        go: ['1.22']
+    runs-on: docker
     steps:
     - name: Checkout Code
       uses: actions/checkout@master
     - name: Setup go
-      uses: actions/setup-go@v3
+      uses: actions/setup-go@v4
       with:
-        go-version: ${{ matrix.go }}
+        go-version: '1.22'
     - name: Run Tests
       run: |
         go test -v -shuffle=on -race --coverprofile=coverage.coverprofile --covermode=atomic ./...
     - name: Upload coverage to Codecov
-      if: success() && matrix.go == '1.20' && matrix.os == 'ubuntu-latest'
       uses: codecov/codecov-action@v3
+      runs-on: ubuntu-latest
       with:
         token: ${{ secrets.CODECOV_TOKEN }} # not required for public repos