Use the pre-installed Chrome driver when running on GitHub (#123)

The GitHub virtual environment already provides a Chrome and a matching Chrome driver.

For installed software see:
https://github.com/actions/virtual-environments/blob/ubuntu20/20220207.1/images/linux/Ubuntu2004-Readme.md#environment-variables-1

For available environment variables see:
https://docs.github.com/en/actions/learn-github-actions/environment-variables

.github/workflows/gradle.yml

@@ -17,9 +17,6 @@ jobs:
       GRADLE_OPTS: -Xmx1500m -Dfile.encoding=UTF-8
     steps:
       - uses: actions/checkout@v2
-      - uses: nanasess/setup-chromedriver@v1.0.5
-        with:
-          chromedriver-version: '96.0.4664.45'
       - name: Set up JDK
         uses: actions/setup-java@v2
         with:

build.gradle

@@ -78,15 +78,23 @@ dependencies {
 apply from: rootProject.file('gradle/testVerbose.gradle')
 
 webdriverBinaries {
-    chromedriver "$chromeDriverVersion"
-    geckodriver "$geckodriverVersion"
+    if (!System.getenv().containsKey('GITHUB_ACTIONS')) {
+        chromedriver "$chromeDriverVersion"
+        geckodriver "$geckodriverVersion"
+    }
 }
 
 tasks.withType(Test) {
     systemProperty "geb.env", "chromeHeadless"
     systemProperty "geb.build.reportsDir", reporting.file("geb/integrationTest")
-    systemProperty "webdriver.chrome.driver", System.getProperty('webdriver.chrome.driver')
-    systemProperty "webdriver.gecko.driver", System.getProperty('webdriver.gecko.driver')
+
+    if (!System.getenv().containsKey('GITHUB_ACTIONS')) {
+        systemProperty 'webdriver.chrome.driver', System.getProperty('webdriver.chrome.driver')
+        systemProperty 'webdriver.gecko.driver', System.getProperty('webdriver.gecko.driver')
+    } else {
+        systemProperty 'webdriver.chrome.driver', "${System.getenv('CHROMEWEBDRIVER')}/chromedriver"
+        systemProperty 'webdriver.gecko.driver', "${System.getenv('GECKOWEBDRIVER')}/geckodriver"
+    }
 }
 
 bootRun {