feat: Introduce Native Image testing build script changes (#701)

Adds additional switch case to build.sh to accommodate native image testing.

Source-Author: Daniel Zou <dzou@users.noreply.github.com>
Source-Date: Mon Oct 18 11:42:09 2021 -0400
Source-Repo: googleapis/synthtool
Source-Sha: d45942be8066ad57bd0509f4a16e1fac78ecc50f
Source-Link: googleapis/synthtool@d45942b

Author: yoshi-automation

.kokoro/build.sh

@@ -69,6 +69,11 @@ integration)
       verify
     RETURN_CODE=$?
     ;;
+graalvm)
+    # Run Unit and Integration Tests with Native Image
+    mvn test -Pnative -Penable-integration-tests
+    RETURN_CODE=$?
+    ;;
 samples)
     SAMPLES_DIR=samples
     # only run ITs in snapshot/ on presubmit PRs. run ITs in all 3 samples/ subdirectories otherwise.

.kokoro/presubmit/graalvm-native.cfg

@@ -0,0 +1,33 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+  key: "TRAMPOLINE_IMAGE"
+  value: "gcr.io/cloud-devrel-kokoro-resources/graalvm"
+}
+
+env_vars: {
+  key: "JOB_TYPE"
+  value: "graalvm"
+}
+
+# TODO: remove this after we've migrated all tests and scripts
+env_vars: {
+  key: "GCLOUD_PROJECT"
+  value: "gcloud-devel"
+}
+
+env_vars: {
+  key: "GOOGLE_CLOUD_PROJECT"
+  value: "gcloud-devel"
+}
+
+env_vars: {
+  key: "GOOGLE_APPLICATION_CREDENTIALS"
+  value: "secret_manager/java-it-service-account"
+}
+
+env_vars: {
+  key: "SECRET_MANAGER_KEYS"
+  value: "java-it-service-account"
+}

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-monitoring.git",
-        "sha": "ac6599842f5320ee4afe2c9e76c50167c3c67ced"
+        "sha": "d27ff7fb0614e136ef85bece07adb65802fb8fbb"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "a4be3384ccb92364795d981f2863f6986fcee620"
+        "sha": "d45942be8066ad57bd0509f4a16e1fac78ecc50f"
       }
     }
   ],
@@ -71,6 +71,7 @@
     ".kokoro/presubmit/clirr.cfg",
     ".kokoro/presubmit/common.cfg",
     ".kokoro/presubmit/dependencies.cfg",
+    ".kokoro/presubmit/graalvm-native.cfg",
     ".kokoro/presubmit/integration.cfg",
     ".kokoro/presubmit/java11.cfg",
     ".kokoro/presubmit/java7.cfg",