PostgreSQL 15 RC1 release announcement draft

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+The PostgreSQL Global Development Group announces that the first release
+candidate of PostgreSQL 15 is now available for download. As a release
+candidate, PostgreSQL 15 RC 1 will be mostly identical to the initial release of
+PostgreSQL 15, though some more fixes may be applied prior to the general
+availability of PostgreSQL 15.
+
+The planned date for the general availability of PostgreSQL 15 is
+October 13, 2022. Please see the "Release Schedule" section for more details.
+
+Upgrading to PostgreSQL 15 RC 1
+-------------------------------
+
+To upgrade to PostgreSQL 15 RC 1 from earlier versions of PostgreSQL, you will
+need to use a major version upgrade strategy, e.g. `pg_upgrade` or
+`pg_dump` / `pg_restore`. For more information, please visit the documentation
+section on [upgrading](https://www.postgresql.org/docs/15/static/upgrading.html):
+
+[https://www.postgresql.org/docs/15/static/upgrading.html](https://www.postgresql.org/docs/15/static/upgrading.html)
+
+Changes Since 15 Beta 4
+-----------------------
+
+Several bug fixes were applied for PostgreSQL 15 during the Beta 4 period. These
+include:
+
+* The syntax for publishing all tables in a schema using logical replication
+is changed to `CREATE PUBLICATION ... FOR TABLES IN SCHEMA ...`.
+* Logical replication publications can now publish tables that are within a
+schema if both schema and table are specified.
+* Disallow publishing a schema if a table with column-lists is specified.
+* Fix issue with `pg_publication_tables` view where it would display dropped
+columns.
+* Disallow creating a new database with an unsupported ICU locale.
+* Fix behavior issue with the `--gzip` option for `pg_basebackup` where the
+contents of the WAL directory were not compressed.
+* Fix issue with recovery prefetching when `maintenance_io_concurrency` was set
+to a low value (e.g. `0`).
+* Log errors when replaying WAL files when `wal_compression` is specified as
+either `lz4` or `zstd` but the server does not support it.
+* Move several files generated by `pg_upgrade` to an internal subdirectory.
+* Clear the display from the `ps` command when the recovery process finishes.
+
+For a detailed list of fixes, please visit the
+[open items](https://wiki.postgresql.org/wiki/PostgreSQL_15_Open_Items#resolved_before_15rc1)
+page.
+
+Release Schedule
+----------------
+
+This is the first release candidate for PostgreSQL 15. Unless an issue is
+discovered that warrants a delay or to produce an additional release candidate,
+PostgreSQL 15 should be made generally available on October 13, 2022.
+
+For further information please see the
+[Beta Testing](https://www.postgresql.org/developer/beta/) page.
+
+Links
+-----
+
+* [Download](https://www.postgresql.org/download/)
+* [Beta Testing Information](https://www.postgresql.org/developer/beta/)
+* [PostgreSQL 15 RC 1 Release Notes](https://www.postgresql.org/docs/15/static/release-15.html)
+* [PostgreSQL 15 Open Issues](https://wiki.postgresql.org/wiki/PostgreSQL_15_Open_Items)
+* [Submit a Bug](https://www.postgresql.org/account/submitbug/)
+* [Follow @postgresql on Twitter](https://www.twitter.com/postgresql)