Prepare pg 15 support (build system and submodules) (#2337)

* Add submodule postgres-15

* Support pg_15 in pgxn/neon

* Renamed zenith -> neon in Makefile

* fix name of codestyle check

* Refactor build system to prepare for building multiple Postgres versions.

Rename "vendor/postgres" to "vendor/postgres-v14"

Change Postgres build and install directory paths to be version-specific:

- tmp_install/build -> pg_install/build/14
- tmp_install/* -> pg_install/14/*

And Makefile targets:

- "make postgres" -> "make postgres-v14"
- "make postgres-headers" -> "make postgres-v14-headers"
- etc.

Add Makefile aliases:

- "make postgres" to build "postgres-v14" and in future, "postgres-v15"
- similarly for "make postgres-headers"

Fix POSTGRES_DISTRIB_DIR path in pytest scripts

* Make postgres version a variable in codestyle workflow

* Support vendor/postgres-v15 in codestyle check workflow

* Support postgres-v15 building in Makefile

* fix pg version in Dockerfile.compute-node

* fix kaniko path

* Build neon extensions in version-specific directories

* fix obsolete mentions of vendor/postgres

* use vendor/postgres-v14 in Dockerfile.compute-node.legacy

* Use PG_VERSION_NUM to gate dependencies in inmem_smgr.c

* Use versioned ECR repositories and image names for compute-node.
The image name format is compute-node-vXX, where XX is postgres major version number.
For now only v14 is supported.
Old format unversioned name (compute-node) is left, because cloud repo depends on it.

* update vendor/postgres submodule url (zenith->neondatabase rename)

* Fix postgres path in python tests after rebase

* fix path in regress test

* Use separate dockerfiles to build compute-node:
Dockerfile.compute-node-v15 should be identical to Dockerfile.compute-node-v14 except for the version number.
This is a hack, because Kaniko doesn't support build ARGs properly

* bump vendor/postgres-v14 and vendor/postgres-v15

* Don't use Kaniko cache for v14 and v15 compute-node images

* Build compute-node images for different versions in different jobs

Co-authored-by: Heikki Linnakangas <heikki@neon.tech>

test_runner/fixtures/neon_fixtures.py

@@ -59,7 +59,7 @@ Env = Dict[str, str]
 Fn = TypeVar("Fn", bound=Callable[..., Any])
 
 DEFAULT_OUTPUT_DIR = "test_output"
-DEFAULT_POSTGRES_DIR = "tmp_install"
+DEFAULT_POSTGRES_DIR = "pg_install/v14"
 DEFAULT_BRANCH_NAME = "main"
 
 BASE_PORT = 15000
@@ -188,7 +188,7 @@ def can_bind(host: str, port: int) -> bool:
     Check whether a host:port is available to bind for listening
 
     Inspired by the can_bind() perl function used in Postgres tests, in
-    vendor/postgres/src/test/perl/PostgresNode.pm
+    vendor/postgres-v14/src/test/perl/PostgresNode.pm
     """
     with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
         # TODO: The pageserver and safekeepers don't use SO_REUSEADDR at the

test_runner/regress/test_pg_regress.py

@@ -26,8 +26,8 @@ def test_pg_regress(neon_simple_env: NeonEnv, test_output_dir: Path, pg_bin, cap
     (runpath / "testtablespace").mkdir(parents=True)
 
     # Compute all the file locations that pg_regress will need.
-    build_path = os.path.join(pg_distrib_dir, "build/src/test/regress")
-    src_path = os.path.join(base_dir, "vendor/postgres/src/test/regress")
+    build_path = os.path.join(pg_distrib_dir, "../build/v14/src/test/regress")
+    src_path = os.path.join(base_dir, "vendor/postgres-v14/src/test/regress")
     bindir = os.path.join(pg_distrib_dir, "bin")
     schedule = os.path.join(src_path, "parallel_schedule")
     pg_regress = os.path.join(build_path, "pg_regress")
@@ -80,8 +80,8 @@ def test_isolation(neon_simple_env: NeonEnv, test_output_dir: Path, pg_bin, caps
     (runpath / "testtablespace").mkdir(parents=True)
 
     # Compute all the file locations that pg_isolation_regress will need.
-    build_path = os.path.join(pg_distrib_dir, "build/src/test/isolation")
-    src_path = os.path.join(base_dir, "vendor/postgres/src/test/isolation")
+    build_path = os.path.join(pg_distrib_dir, "../build/v14/src/test/isolation")
+    src_path = os.path.join(base_dir, "vendor/postgres-v14/src/test/isolation")
     bindir = os.path.join(pg_distrib_dir, "bin")
     schedule = os.path.join(src_path, "isolation_schedule")
     pg_isolation_regress = os.path.join(build_path, "pg_isolation_regress")
@@ -124,7 +124,7 @@ def test_sql_regress(neon_simple_env: NeonEnv, test_output_dir: Path, pg_bin, ca
 
     # Compute all the file locations that pg_regress will need.
     # This test runs neon specific tests
-    build_path = os.path.join(pg_distrib_dir, "build/src/test/regress")
+    build_path = os.path.join(pg_distrib_dir, "../build/v14/src/test/regress")
     src_path = os.path.join(base_dir, "test_runner/sql_regress")
     bindir = os.path.join(pg_distrib_dir, "bin")
     schedule = os.path.join(src_path, "parallel_schedule")