chore: Add custom tag for pg build in ad-hoc image builder

[abhvsn]

Description

PR to add support for custom pg image during the ad-hoc-builder script. Procedure for the hotfixes from v1.45 is as follows:

Steps to perform the hotfix:

1. Create a hotfix branch from the tag where we need the hotfix, hotfix/<version> and note down the commit-sha
2. Create hotfix branch pg-hotfix/<version> from commit sha on pg branch from step 1
3. Cherry-pick commits from release to hotfix branches
4. Build the server locally by running ./build.sh -DskipTests within server directory to avoid any build failures at later stages on both the hotfix branches
5. If we are seeing any build failure involve @db-infra team as required
6. Run the ad-hoc image builder with pg-hotfix/<version> branch to generate pg specific tag pg-vx.y.z
7. Do the sanity testing with postgres url
8. Only after successful generation of pg-vx.y.z tag from step 4, run the ad-hoc image builder with hotfix/<version> branch to generate specific tag vx.y.z and pass the pg_tag created in step 4 i.e. pg-vx.y.z
9. Do the sanity test for mongo DB URLs on vx.y.z
10. Ask devops to create latest tags from vx.y.z as this is not supported in the ad-hoc image generation script. Make sure to have support for platforms: linux/arm64,linux/amd64

Fixes #36838

/test Sanity

🔍 Cypress test results

Warning

Tests have not run on the HEAD 9af256c yet

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Wed, 16 Oct 2024 13:05:17 UTC

Communication

Should the DevRel and Marketing teams inform users about this change?

• Yes
• No