split out JMH into separate job, remove redundant java_home env

Author: ktoso

.github/workflows/pull_request.yml

@@ -26,7 +26,6 @@ jobs:
     container:
       image: ${{ (contains(matrix.swift_version, 'nightly') && 'swiftlang/swift') || 'swift' }}:${{ matrix.swift_version }}-${{ matrix.os_version }}
     env:
-      JAVA_HOME: "/usr/lib/jvm/default-jdk"
       SWIFT_JAVA_VERBOSE: true
     steps:
       - uses: actions/checkout@v4
@@ -36,6 +35,24 @@ jobs:
         run: ./gradlew build -x test
       - name: Gradle :SwiftKit:check
         run: ./gradlew :SwiftKit:check --debug
+
+  benchmark-java:
+    name: Benchmark (JMH) (${{ matrix.os_version }} swift:${{ matrix.swift_version }} jdk:${{matrix.jdk_vendor}})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        swift_version: ['6.1.2']
+        os_version: ['jammy']
+        jdk_vendor: ['corretto']
+    container:
+      image: ${{ (contains(matrix.swift_version, 'nightly') && 'swiftlang/swift') || 'swift' }}:${{ matrix.swift_version }}-${{ matrix.os_version }}
+    env:
+      SWIFT_JAVA_VERBOSE: true
+    steps:
+      - uses: actions/checkout@v4
+      - name: Prepare CI Environment
+        uses: ./.github/actions/prepare_env
       - name: Gradle compile JMH benchmarks
         run: ./gradlew compileJmh --info
 
@@ -49,7 +66,6 @@ jobs:
         os_version: ['macos']
         jdk_vendor: ['corretto']
     env:
-      JAVA_HOME: "/usr/lib/jvm/default-jdk"
       SWIFT_JAVA_VERBOSE: true
     steps:
       - uses: actions/checkout@v4
@@ -74,7 +90,6 @@ jobs:
     container:
       image: ${{ (contains(matrix.swift_version, 'nightly') && 'swiftlang/swift') || 'swift' }}:${{ matrix.swift_version }}-${{ matrix.os_version }}
     env:
-      JAVA_HOME: "/usr/lib/jvm/default-jdk"
       SWIFT_JAVA_VERBOSE: true
     steps:
       - uses: actions/checkout@v4
@@ -95,7 +110,6 @@ jobs:
         os_version: ['macos']
         jdk_vendor: ['corretto']
     env:
-      JAVA_HOME: "/usr/lib/jvm/default-jdk"
       SWIFT_JAVA_VERBOSE: true
     steps:
       - uses: actions/checkout@v4
@@ -126,8 +140,6 @@ jobs:
         ]
     container:
       image: ${{ (contains(matrix.swift_version, 'nightly') && 'swiftlang/swift') || 'swift' }}:${{ matrix.swift_version }}-${{ matrix.os_version }}
-    env:
-      JAVA_HOME: "/usr/lib/jvm/default-jdk"
     steps:
       - uses: actions/checkout@v4
       - name: Prepare CI Environment
@@ -152,8 +164,6 @@ jobs:
           'SwiftAndJavaJarSampleLib',
           'SwiftKitSampleApp',
         ]
-    env:
-      JAVA_HOME: "/usr/lib/jvm/default-jdk"
     steps:
       - uses: actions/checkout@v4
       - name: Prepare CI Environment