Check ORCA and GPOPT formatting in Concourse.

This patch adds a simple job that checks for the clang-format
conformance, similar to the Travis CI job did in commit 54273fdd
(greenplum-db/gpdb#10357).

I was not amused when I realized the gen_pipeline.py doesn't do the due
diligence of finding transitive dependencies (so the new job actually
already blocks release, but the script insists on stopping at immediate
blockers). But that's left for another day.

(cherry picked from commit 868fd2d7)

concourse/pipelines/5X_STABLE-generated.yml

@@ -12,7 +12,7 @@
 ## file (example: templates/gpdb-tpl.yml) and regenerate the pipeline
 ## using appropriate tool (example: gen_pipeline.py -t prod).
 ## ----------------------------------------------------------------------
-## Generated by gen_pipeline.py at: 2020-09-17 11:45:46.405268
+## Generated by gen_pipeline.py at: 2020-10-01 16:57:20.943390
 ## Template file: gpdb-tpl.yml
 ## OS Types: ['centos6', 'centos7', 'sles', 'aix7', 'win', 'ubuntu16']
 ## Test Sections: ['ICW', 'CS', 'MPP', 'MM', 'DPM', 'UD', 'FileRep', 'AA']
@@ -30,6 +30,7 @@ groups:
 - name: 5X_STABLE
   jobs:
   ## --------------------------------------------------------------------
+  - check_format
   - gate_compile_start
   - compile_gpdb_centos6
   - prepare_binary_swap_gpdb_centos6
@@ -337,6 +338,11 @@ resources:
     private_key: {{ccp-git-key}}
     uri: {{ccp-git-remote}}
 
+- name: clang_toolchain
+  type: registry-image
+  source:
+    repository: gcr.io/data-orca/clang-toolchain
+
 - name: ccp-image
   type: registry-image
   source:
@@ -1066,6 +1072,16 @@ cs_ccp_run_tests_params_anchor: &cs_ccp_run_tests_params
 
 jobs:
 
+- name: check_format
+  plan:
+    - in_parallel:
+      - get: gpdb_src
+        trigger: true
+      - get: clang_toolchain
+    - task: check_format
+      image: clang_toolchain
+      file: gpdb_src/concourse/tasks/check_format.yml
+
 ## ======================================================================
 ##   ____                      _ _
 ##  / ___|___  _ __ ___  _ __ (_) | ___
@@ -1079,6 +1095,8 @@ jobs:
   plan:
   - in_parallel:
     - get: gpdb_src
+      passed:
+        - check_format
       trigger: true
     - get: gpaddon_src
       trigger: true
@@ -4474,6 +4492,7 @@ jobs:
       passed:
       - compile_gpdb_centos6
       - compile_gpdb_open_source_centos6
+      - check_format
       - compile_gpdb_centos7
       - compile_gpdb_sles11
       - compile_gpdb_ubuntu16

concourse/pipelines/templates/gpdb-tpl.yml

@@ -45,6 +45,7 @@ groups:
 - name: 5X_STABLE
   jobs:
   ## --------------------------------------------------------------------
+  - check_format
   - gate_compile_start
   - compile_gpdb_centos6
   - prepare_binary_swap_gpdb_centos6
@@ -365,6 +366,11 @@ resources:
     private_key: {{ccp-git-key}}
     uri: {{ccp-git-remote}}
 
+- name: clang_toolchain
+  type: registry-image
+  source:
+    repository: gcr.io/data-orca/clang-toolchain
+
 - name: ccp-image
   type: registry-image
   source:
@@ -1109,6 +1115,16 @@ cs_ccp_run_tests_params_anchor: &cs_ccp_run_tests_params
 
 jobs:
 
+- name: check_format
+  plan:
+    - in_parallel:
+      - get: gpdb_src
+        trigger: true
+      - get: clang_toolchain
+    - task: check_format
+      image: clang_toolchain
+      file: gpdb_src/concourse/tasks/check_format.yml
+
 ## ======================================================================
 ##   ____                      _ _
 ##  / ___|___  _ __ ___  _ __ (_) | ___
@@ -1122,6 +1138,8 @@ jobs:
   plan:
   - in_parallel:
     - get: gpdb_src
+      passed:
+        - check_format
       trigger: true
     - get: gpaddon_src
       trigger: true
@@ -3823,6 +3841,7 @@ jobs:
       passed:
       - compile_gpdb_centos6
       - compile_gpdb_open_source_centos6
+      - check_format
       - compile_gpdb_centos7
       - compile_gpdb_sles11
       - compile_gpdb_ubuntu16

concourse/tasks/check_format.yml

+platform: linux
+image_resource:
+  type: registry-image
+  source:
+    repository: gcr.io/data-orca/clang-toolchain
+
+inputs:
+  - name: gpdb_src
+    path: .
+run:
+  path: src/tools/fmt
+  args: [ chk ]
+params:
+  CLANG_FORMAT: clang-format-10