ci: Improve GitHub actions across platforms

- Improve Windows compatibility in build workflow
- Optimize unit testing for pull requests
- Upgrade Coveralls GitHub action to v2 for improved coverage tracking

.github/workflows/build.yml

@@ -25,8 +25,21 @@ jobs:
       - name: Check out code into the Go module directory
         uses: actions/checkout@v2
 
-      - name: Format
-        run: diff -u <(echo -n) <(gofmt -d .)
+      - name: Format Check
+        if: matrix.os == 'windows-latest'
+        run: |
+          $files = gofmt -l .
+          if ($files) {
+            Write-Output "Unformatted files:"
+            Write-Output $files
+            exit 1
+          }
+        shell: pwsh
+
+      - name: Format Check
+        if: matrix.os != 'windows-latest'
+        run: |
+          diff -u <(echo -n) <(gofmt -d .)
 
       - name: Get dependencies
         run: |

.github/workflows/unittest.yml

@@ -1,5 +1,5 @@
 on:
-  [push, pull_request]
+  [pull_request]
 
 name: run tests
 jobs:
@@ -37,7 +37,7 @@ jobs:
       - name: Convert coverage.out to coverage.lcov
         uses: jandelgado/gcov2lcov-action@v1
       - name: Coveralls
-        uses: coverallsapp/github-action@v1.1.2
+        uses: coverallsapp/github-action@v2
         with:
           github-token: ${{ secrets.github_token }}
           path-to-lcov: coverage.lcov