build: migrate release scripts (googleapis#1799) (googleapis#1347)

* build: migrate release scripts (googleapis#1799)

Source-Link: googleapis/synthtool@1fd6dff
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:ad9cabee4c022f1aab04a71332369e0c23841062124818a4490f73337f790337

* build: only append common_env_vars if it doesn't exist

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Jeff Ching <chingor@google.com>

Author: gcf-owl-bot[bot]

java-logging/.github/.OwlBot.lock.yaml

@@ -13,4 +13,4 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-java:latest
-  digest: sha256:8dd8395defb6a5069b0b10c435058bf13980606ba1967e2b3925ed50fc3cb22f
+  digest: sha256:ad9cabee4c022f1aab04a71332369e0c23841062124818a4490f73337f790337

java-logging/.github/release-trigger.yml

@@ -1 +1,2 @@
 enabled: true
+multiScmName: java-logging

java-logging/.kokoro/release/common.cfg

@@ -67,3 +67,23 @@ env_vars: {
 
 ###################################################
 
+
+
+#############################################
+# this section merged from .kokoro/common_env_vars.cfg using owlbot.py
+
+env_vars: {
+    key: "PRODUCT_AREA_LABEL"
+    value: "observability"
+}
+env_vars: {
+    key: "PRODUCT_LABEL"
+    value: "logging"
+}
+env_vars: {
+    key: "LANGUAGE_LABEL"
+    value: "java"
+}
+
+###################################################
+

java-logging/owlbot.py

@@ -100,20 +100,25 @@
 # Modify test configs
 # --------------------------------------------------------------------------
 
-# add shared environment variables to test configs
-s.move(
-    ".kokoro/common_env_vars.cfg",
-    ".kokoro/common.cfg",
-    merge=lambda src, dst, _, : f"{dst}\n{src}",
+def _append_if_not_contained(src: str, dest: str, file: str):
+    if src in dest:
+        return dest
+    return f"{dest}\n{src}"
+
+def append_new_content(src: str, dest: str):
+    # add shared environment variables to test configs
+    s.move(
+        src,
+        dest,
+        merge=_append_if_not_contained,
 )
+
+append_new_content(".kokoro/common_env_vars.cfg", ".kokoro/common.cfg")
+
 tracked_subdirs = ["continuous", "presubmit", "release", "nightly"]
 for subdir in tracked_subdirs:
     for path, subdirs, files in os.walk(f".kokoro/{subdir}"):
         for name in files:
             if name == "common.cfg":
                 file_path = os.path.join(path, name)
-                s.move(
-                    ".kokoro/common_env_vars.cfg",
-                    file_path,
-                    merge=lambda src, dst, _, : f"{dst}\n{src}",
-                )
+                append_new_content(".kokoro/common_env_vars.cfg", file_path)