Fix/ci init and workflow

[DUptain1993]

High-level PR Summary

This PR simplifies the CI initialization process by replacing a complex repository synchronization script with a minimal, idempotent initialization template and adds a basic GitHub Actions workflow that runs the simplified init script on pushes and pull requests to the main branch.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	ci/init_repo.sh
2	.github/workflows/ci.yml

[recurseml]

Review by RecurseML

🔍 Review performed on 3b09158..89e6c9d

Severity	Location	Issue	Delete
	ci/init_repo.sh:22	Breaking API change causes workflow crash

✅ Files analyzed, no issues (1)

• .github/workflows/ci.yml

[recurseml]

BREAKING CHANGE: The init_repo.sh script has been gutted, removing all repository initialization logic (repo tool installation, repo init, repo sync) that existing workflows depend on. The unchanged workflow file .github/workflows/build-twrp.yml at lines 81-85 calls this script with 4 parameters expecting it to initialize a TWRP build environment by syncing source code to ~/twrp/. However, the modified script now only creates ~/bin and exports PATH, then exits claiming "Init complete."

This will cause build-twrp.yml to CRASH with the following sequence:

1. Line 81-85: Calls init_repo.sh successfully, but no source code is synced
2. Line 96: Executes 'source build/envsetup.sh' which will FAIL with error: "bash: build/envsetup.sh: No such file or directory" because the TWRP source tree was never initialized
3. The workflow will terminate with a non-zero exit code

The old script accepted parameters: <manifest_url> [desired_branch] [workdir] [jobs] and performed:

• Repo tool installation to $HOME/bin/repo
• Git ls-remote to query available branches
• Branch selection logic
• repo init --depth=1 -u $MANIFEST_URL -b $BRANCH
• repo sync with retry logic (up to 5 attempts)
• Created and populated the working directory (~/twrp by default)

The new script ignores all parameters and performs none of these operations, making build-twrp.yml fail at the 'Setup Build Environment' step when it tries to source the non-existent build/envsetup.sh file.

Affected unchanged code locations:

• .github/workflows/build-twrp.yml:81-85 (script invocation with 4 parameters)
• .github/workflows/build-twrp.yml:96 (source build/envsetup.sh - will fail)
• .github/workflows/build-twrp.yml:103 (source build/envsetup.sh - will fail)
• .github/workflows/build-twrp.yml:106-107 (lunch and mka commands - will fail due to missing environment)

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