[OSS-ONLY] Implementing hashcode and mode based caching

[SiddharthBITS]

Description
This commit implements a more efficient method of caching compilations. Cache now restored will now be guaranteed to compatible with the version and build configuration of compilations.

We will now save 5-8 mins in version upgrade and dump restore tests.

Key changes:

• Implemented new format for cache keys which includes github hashcode of corresponding engine branch and build mode to better identify the cache stored in a key.
• New format "ccache-engineHashcode-buildMode-extensionHashcode".
• Cache restoration handled by build-modified-postgres.yml and saving by save-ccache.yml composite actions.
• Removed timeStamp based caching.

Task: BABEL-5564
Signed-off-by: Siddharth Sengar [email protected]

Check List

• Commits are signed per the DCO using --signoff

By submitting this pull request,
I confirm that my contribution is under the terms of the Apache 2.0 and PostgreSQL licenses, and grant any person obtaining a copy of the contribution permission to relicense all or a portion of my contribution to the PostgreSQL License solely to contribute all or a portion of my contribution to the PostgreSQL open source project.

For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[coveralls]

Pull Request Test Coverage Report for Build 12830872482

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.003%) to 74.956%

---

Totals
Change from base Build 12805401204:	0.003%
Covered Lines:	46993
Relevant Lines:	62694

---

💛 - Coveralls

[tanscorpio7]

Let us name this checkout Modified PostgreSQL for Babelfish

[tanscorpio7]

Let us also unset CRESTORE_KEY

[shah-nirmit]

Question: So this will only match by Engine SHA followed by whatever sha matches for extension, so if Extension has some new code changes will the action ensure the newest version of cache for that PR is used?

[SiddharthBITS]

if [[ ${{ github.event_name != 'pull_request' || env.SAVE_CCACHE == 1 }} == true ]]; then
echo "Cache to be Saved"
echo "SAVE_CACHE_HERE=1" >> $GITHUB_ENV

We are force saving cache for any request that isn't a PR, so a merge would trigger this.