Explicitly set derived data path for “Build and test" and "Upload code coverage report"

Author: phil1995

.github/workflows/build.yml

@@ -7,6 +7,8 @@ jobs:
   build:
     name: Build and test
     runs-on: macos-latest
+    env:
+      DERIVED_DATA_PATH: 'DerivedData'
     if: "!contains(github.event.head_commit.message, '[ci skip]') && !contains(github.event.head_commit.message, '[skip ci]')"
     steps:
       - uses: actions/checkout@v2
@@ -21,11 +23,11 @@ jobs:
           ./Scripts/process.sh
           exit $?
       - name: Build and test
-        run: set -o pipefail && env NSUnbufferedIO=YES xcodebuild -scheme 'CryptomatorCryptoLib' -destination 'platform=macOS' -enableCodeCoverage YES clean test | xcpretty
+        run: set -o pipefail && env NSUnbufferedIO=YES xcodebuild -scheme 'CryptomatorCryptoLib' -destination 'platform=macOS' -derivedDataPath $DERIVED_DATA_PATH -enableCodeCoverage YES clean test | xcpretty
       - name: Upload code coverage report
         run: |
           gem install slather
-          slather coverage -x -i '../../../Library/*' --scheme CryptomatorCryptoLib CryptomatorCryptoLib.xcodeproj
+          slather coverage -x --build-directory $DERIVED_DATA_PATH --ignore "$DERIVED_DATA_PATH/SourcePackages/*" --scheme CryptomatorCryptoLib CryptomatorCryptoLib.xcodeproj
           bash <(curl -Ls https://coverage.codacy.com/get.sh)
         env:
           CODACY_PROJECT_TOKEN: ${{ secrets.CODACY_PROJECT_TOKEN }}