Add Prow-style OWNERS files.

Based on the last CODEOWNERS version, removed in
https://github.com/apache/beam/pull/6049/files.

.test-infra/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - lgajowy

.test-infra/jenkins/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - lgajowy
+  - kkucharc
+  - echauchot

.test-infra/jupyter/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - udim

.test-infra/kubernetes/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - lgajowy
+  - kkucharc

OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+filters:
+  # Per-language reviewers.
+  "\\.go$":
+    reviewers:
+      - herohde
+  "\\.java$":
+    reviewers:
+      - lukecwik
+      - kennknowles
+      - aaltay
+  "\\.py$":
+    reviewers:
+      - pabloem
+      - robertwb
+      - aaltay
+      - charlesccychen
+
+  "build\\.gradle$":
+    reviewers:
+      - lukecwik

assembly.xml

@@ -100,6 +100,9 @@
                 <!-- release-plugin temp files -->
                 <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?pom\.xml\.releaseBackup]</exclude>
                 <exclude>%regex[(?!((?!${project.build.directory}/)[^/]+/)*src/)(.*/)?release\.properties]</exclude>
+
+                <!-- code review related -->
+                <exclude>**/OWNERS</exclude>
             </excludes>
         </fileSet>
         <!-- license, readme, etc. calculated at build time -->

build.gradle

@@ -147,6 +147,7 @@ rat {
 
     // Ignore ownership files
     "ownership/**/*",
+    "**/OWNERS",
   ]
 
   // Add .gitignore excludes to the Apache Rat exclusion list. We re-create the behavior

buildSrc/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - lukecwik

examples/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - aaltay

examples/java/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - lukecwik
+  - aaltay

gradle/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - lukecwik

model/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - herohde
+  - lukecwik

model/fn-execution/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - herohde
+  - robertwb
+  - lukecwik

model/job-management/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - herohde
+  - robertwb
+  - lukecwik

model/pipeline/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - herohde
+  - robertwb
+  - lukecwik

release/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - jbonofre

runners/core-construction-java/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - lukecwik

runners/core-java/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - lukecwik

runners/core-java/src/main/java/org/apache/beam/runners/core/metrics/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - echauchot

runners/direct-java/OWNERS

+# See the OWNERS docs at https://s.apache.org/beam-owners
+
+reviewers:
+  - lukecwik