Document the generate-job-summary options

Fixes #646

README.md

@@ -321,37 +321,28 @@ Gradle Home cache cleanup is disabled by default.  You can enable this feature f
 gradle-home-cache-cleanup: true
 ```
 
-## Saving build outputs
+## Build reporting
 
-By default, a GitHub Actions workflow using `gradle-build-action` will record the log output and any Build Scan links for your build,
-but any output files generated by the build will not be saved.
-
-To save selected files from your build execution, you can use the core [Upload-Artifact](https://github.com/actions/upload-artifact) action.
-For example:
+The `gradle-build-action` collects information about any Gradle executions that occur in a workflow, and reports these via
+a Job Summary, visible in the GitHub Actions UI. For each Gradle execution, details about the invocation are listed, together with
+a link to any Build Scan® published.
 
+Generation of a Job Summary is enabled by default. If this is not desired, it can be disable as follows:
 ```yaml
-jobs:   
-  gradle:
-    runs-on: ubuntu-latest
-    steps:
-    - name: Checkout project sources
-      uses: actions/checkout@v3
-    - name: Setup Gradle
-      uses: gradle/gradle-build-action@v2
-    - name: Run build with Gradle wrapper
-      run: ./gradlew build --scan
-    - name: Upload build reports
-      uses: actions/upload-artifact@v3
-      with:
-        name: build-reports
-        path: build/reports/
+generate-job-summary: false
 ```
 
-## Build scans
+Note that the action collects information about Gradle invocations via an [Initialization Script](https://docs.gradle.org/current/userguide/init_scripts.html#sec:using_an_init_script)
+located at `USER_HOME/.gradle/init.d/build-result-capture.init.gradle`.
+If you are using init scripts for the [Gradle Enterprise Gradle Plugin](https://plugins.gradle.org/plugin/com.gradle.enterprise) like
+[`scans-init.gradle` or `gradle-enterprise-init.gradle`](https://docs.gradle.com/enterprise/gradle-plugin/#scans_gradle_com),
+you'll need to ensure these files are applied prior to `build-result-capture.init.gradle`.
+Since Gradle applies init scripts in alphabetical order, one way to ensure this is via file naming.
 
-If your build publishes a [build scan](https://gradle.com/build-scans/) the `gradle-build-action` action will:
-- Add a notice with the link to the GitHub Actions user interface
-- For each step that executes Gradle, adds the link to the published build scan as a Step output named `build-scan-url`.
+### Build scan link as Step output
+
+As well as reporting the [Build Scan](https://gradle.com/build-scans/) link in the Job Summary,
+the `gradle-build-action` action makes this link available as a Step output named `build-scan-url`.
 
 You can then use that link in subsequent actions of your workflow. For example:
 
@@ -384,12 +375,31 @@ jobs:
           })
 ```
 
-Note that the build scan capturing utilizes the [Initialization Script](https://docs.gradle.org/current/userguide/init_scripts.html#sec:using_an_init_script)
-in the `USER_HOME/.gradle/init.d/` directory, with the file named `build-result-capture.init.gradle`.
-So, if you are using the init scripts for the [Gradle Enterprise Gradle Plugin](https://plugins.gradle.org/plugin/com.gradle.enterprise) like
-[`scans-init.gradle` or `gradle-enterprise-init.gradle`](https://docs.gradle.com/enterprise/gradle-plugin/#scans_gradle_com),
-make sure that its file names have earlier alphabetical order to the `build-result-capture.init.gradle`,
-since configuring capture requires Gradle Enterprise Gradle Plugin to be applied already.
+### Saving build outputs
+
+By default, a GitHub Actions workflow using `gradle-build-action` will record the log output and any Build Scan links for your build,
+but any output files generated by the build will not be saved.
+
+To save selected files from your build execution, you can use the core [Upload-Artifact](https://github.com/actions/upload-artifact) action.
+For example:
+
+```yaml
+jobs:   
+  gradle:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout project sources
+      uses: actions/checkout@v3
+    - name: Setup Gradle
+      uses: gradle/gradle-build-action@v2
+    - name: Run build with Gradle wrapper
+      run: ./gradlew build --scan
+    - name: Upload build reports
+      uses: actions/upload-artifact@v3
+      with:
+        name: build-reports
+        path: build/reports/
+```
 
 ## Support for GitHub Enterprise Server (GHES)