Force extension test with 0 worker when run from pipeline (#272)

* force worker count 0

* hll version compat

.circleci/config.yml

@@ -78,6 +78,7 @@ jobs:
       - run:
           command: |
             cd ./azure
+            export EXTENSION_TEST=1
             ./citus-bot.sh citusbot_extension_test_resource_group
           name: install dependencies and run extension tests
           no_output_timeout: 10m 

fabfile/extension_confs/extension_default.ini

@@ -1,5 +1,5 @@
 [main]
-postgres_versions: ['14.5', '15beta4']
+postgres_versions: ['15.2']
 extensions: ['citus', 'hll', 'topn', 'tdigest', 'auto_explain', 'bloom', 'adminpack', 'amcheck', 'btree_gin', 'btree_gist', 'citext', 'cube',
              'dblink', 'dict_int', 'dict_xsyn', 'earthdistance', 'file_fdw', 'fuzzystrmatch', 'hstore', 'intarray', 'isn', 'lo', 'ltree',
              'pageinspect', 'passwordcheck', 'pgcrypto', 'pgstattuple', 'pg_surgery', 'pg_trgm', 'pg_visibility', 'postgres_fdw', 'seg', 'tablefunc',
@@ -12,7 +12,7 @@ preload: True
 create: True
 configure: True
 repo_url: https://github.com/citusdata/citus.git
-git_ref: release-11.1
+git_ref: release-11.3
 relative_test_path: ./src/test/regress
 conf_string: '''
     citus.hide_citus_dependent_objects=true
@@ -27,7 +27,7 @@ preload: False
 create: True
 configure: False
 repo_url: https://github.com/citusdata/postgresql-hll.git
-git_ref: v2.16
+git_ref: v2.17
 relative_test_path: .
 
 [topn]