Move steps for preparing a Gradle build into a reusable action

Closes gh-40443

Author: wilkinsona

.github/actions/build/action.yml

@@ -32,32 +32,11 @@ outputs:
 runs:
   using: composite
   steps:
-    - name: Set Up Java
-      uses: actions/setup-java@v4
+    - name: Prepare Gradle Build
+      uses: ./.github/actions/prepare-gradle-build
       with:
-        distribution: 'liberica'
-        java-version: |
-          ${{ inputs.java-version }}
-          ${{ inputs.java-toolchain && '17' || '' }}
-    - name: Set Up Gradle
-      uses: gradle/actions/setup-gradle@6cec5d49d4d6d4bb982fbed7047db31ea6d38f11 #v3.3.0
-      with:
-        cache-read-only: false
-    - name: Configure Gradle Properties
-      shell: bash
-      run: |
-        mkdir -p $HOME/.gradle
-        echo 'systemProp.user.name=spring-builds+github' >> $HOME/.gradle/gradle.properties
-        echo 'systemProp.org.gradle.internal.launcher.welcomeMessageEnabled=false' >> $HOME/.gradle/gradle.properties
-        echo 'org.gradle.daemon=false' >> $HOME/.gradle/gradle.properties
-    - name: Configure Toolchain Properties
-      if: ${{ inputs.java-toolchain }}
-      shell: bash
-      run: |
-        echo toolchainVersion=${{ inputs.java-version }} >> $HOME/.gradle/gradle.properties
-        echo systemProp.org.gradle.java.installations.auto-detect=false >> $HOME/.gradle/gradle.properties
-        echo systemProp.org.gradle.java.installations.auto-download=false >> $HOME/.gradle/gradle.properties
-        echo systemProp.org.gradle.java.installations.paths=${{ format('$JAVA_HOME_{0}_X64', inputs.java-version) }} >> $HOME/.gradle/gradle.properties
+        java-version: ${{ inputs.java-version }}
+        java-toolchain: ${{ inputs.java-toolchain }}
     - name: Build
       id: build
       if: ${{ !inputs.publish }}

.github/actions/prepare-gradle-build/action.yml

@@ -0,0 +1,40 @@
+name: 'Prepare Gradle Build'
+description: 'Prepares a Gradle build. Sets up Java and Gradle and configures Gradle properties'
+inputs:
+  java-version:
+    required: false
+    default: '17'
+    description: 'The Java version to use for the build'
+  java-toolchain:
+    required: false
+    default: false
+    description: 'Whether a Java toolchain should be used'
+runs:
+  using: composite
+  steps:
+    - name: Set Up Java
+      uses: actions/setup-java@v4
+      with:
+        distribution: 'liberica'
+        java-version: |
+          ${{ inputs.java-version }}
+          ${{ inputs.java-toolchain && '17' || '' }}
+    - name: Set Up Gradle
+      uses: gradle/actions/setup-gradle@6cec5d49d4d6d4bb982fbed7047db31ea6d38f11 #v3.3.0
+      with:
+        cache-read-only: false
+    - name: Configure Gradle Properties
+      shell: bash
+      run: |
+        mkdir -p $HOME/.gradle
+        echo 'systemProp.user.name=spring-builds+github' >> $HOME/.gradle/gradle.properties
+        echo 'systemProp.org.gradle.internal.launcher.welcomeMessageEnabled=false' >> $HOME/.gradle/gradle.properties
+        echo 'org.gradle.daemon=false' >> $HOME/.gradle/gradle.properties
+    - name: Configure Toolchain Properties
+      if: ${{ inputs.java-toolchain }}
+      shell: bash
+      run: |
+        echo toolchainVersion=${{ inputs.java-version }} >> $HOME/.gradle/gradle.properties
+        echo systemProp.org.gradle.java.installations.auto-detect=false >> $HOME/.gradle/gradle.properties
+        echo systemProp.org.gradle.java.installations.auto-download=false >> $HOME/.gradle/gradle.properties
+        echo systemProp.org.gradle.java.installations.paths=${{ format('$JAVA_HOME_{0}_X64', inputs.java-version) }} >> $HOME/.gradle/gradle.properties