Your lock file does not contain a compatible set of packages. Please run composer update.
Problem 1
- cweagans/composer-patches is locked to version 1.6.7 and an update of this package was not requested.
- cweagans/composer-patches 1.6.7 requires composer-plugin-api ^1.0 -> found composer-plugin-api[2.0.0] but it does not match the constraint.
Problem 2
- zaporylie/composer-drupal-optimizations is locked to version 1.1.1 and an update of this package was not requested.
- zaporylie/composer-drupal-optimizations 1.1.1 requires composer-plugin-api ^1.1 -> found composer-plugin-api[2.0.0] but it does not match the constraint.

You are using Composer 2, which some of your plugins seem to be incompatible with. Make sure you update your plugins or report a plugin-issue to ask them to support Composer 2.

Using following command to initialise:

terminus build:project:create "pantheon-systems/drupal-9-with-circleci-orb:dev-master" manarock --stability=dev --team='Mana Rock Limited' --region eu --org="manarockltd" [build.txt](https://github.com/pantheon-systems/drupal-9-with-circleci-orb/files/6264078/build.txt)

eventually errors with (at step 18):

`18/24 [=====================>------] 75% [notice] Install site on manarock.dev
[notice] Enabled on-server development via SFTP for "dev"
[notice] - drush site-install --yes --account-mail='[email protected]' --account-name=admin --account-pass="[REDACTED]" --site-mail='[email protected]' --site-name=manarock
Warning: Permanently added '[appserver.dev.2037e926-8d0f-4d18-aec3-be74dd8b61a3.drush.in]:2222,[34.91.25.187]:2222' (RSA) to the list of known hosts.
dev.2037e926-8d0f-4d18-aec3-be74dd8b61a3@appserver.dev.2037e926-8d0f-4d18-aec3-be74dd8b61a3.drush.in's password:

// You are about to DROP all tables in your 'pantheon' database. Do you want to
// continue?: yes.

[notice] Starting Drupal installation. This takes a while.

In install.core.inc line 2298:

Database settings:

Array

site:install [--db-url DB-URL] [--db-prefix DB-PREFIX] [--db-su DB-SU] [--db-su-pw DB-SU-PW] [--account-name [ACCOUNT-NAME]] [--account-mail [ACCOUNT-MAIL]] [--site-mail [SITE-MAIL]] [--account-pass ACCOUNT-PASS] [--locale [LOCALE]] [--site-name [SITE-NAME]] [--site-pass SITE-PASS] [--sites-subdir SITES-SUBDIR] [--config-dir CONFIG-DIR] [--existing-config] [-h|--help] [-q|--quiet] [-v|vv|vvv|--verbose] [-V|--version] [--ansi] [--no-ansi] [-n|--no-interaction] [-d|--debug] [-y|--yes] [--no] [--remote-host REMOTE-HOST] [--remote-user REMOTE-USER] [-r|--root ROOT] [-l|--uri URI] [--simulate] [--pipe] [-D|--define DEFINE] [--xh-link XH-LINK] [--notify] [--druplicon] [--] [...]

[CompletionWrapper] Install site failed with exit code 1
[CompletionWrapper] Exit code 1
24/24 [============================] 100%`

Any thoughts on resolution, or is this solely an issue with the build process as opposed to anything else?

Am now in a position where I have an environment on .dev on pantheon, installer tries to run if you visit it, a repo on git hub (empty) and nothing on CircleCi. If I can manually complete without issue at this point I would - but need to be sure that I will have the correct end state.

Complete build log also attached.

The README currently says:

Warning: Drupal 9 sets a higher required version for MariaDB than is currently available on Pantheon. This repository uses patches to circumvent installation errors related to the database version. Pantheon engineering is working to make a higher version available in the coming months. Until the higher version is available, we do not recommend switching your production websites to Drupal 9.

We should be able to remove this warning after pantheon-systems/terminus-build-tools-plugin#368 is done.

Hello,
we are using early access of the Pantheon Drupal9 server and faced an issue as was discovered with SFTP.
After switching on SFTP and changing files by it we could saw changes on a server but after switching back to GIT mode they disappeared.
We think that our codebase on the Pantheon environment not updating after changing of push mode.
Here is some log:
https://monosnap.com/direct/OV7wKbXhOd4iQDy037WTwHSAHJ99lK
https://monosnap.com/direct/ZEyemZWhfOfdMYDt68sIJHgaq0jjtt

After we delete this environment and try to create a new one on this branch pantheon don't create it.
https://monosnap.com/direct/d8kXsgzhE64j2BkxkS4Li4tHUMh5jG
https://monosnap.com/direct/gNVqBWurypLC9KrTb3kFV8Gg1KrOI6
we can see it in the list of branches but pantheon sad that we have one already:
https://monosnap.com/direct/3IolA9BzCairbqQ4PrG1rJOfjHNcbJ
https://monosnap.com/direct/dLydVSnOxO4aJjcQfioLWdWwECrd7P
Also, we don't have the ability to delete this branch:
https://monosnap.com/direct/v0MousMEhgTSSfpLj8ZLLpCYUVDUA0

Please, look into it!
Thanks.

Best regards!