[bump minor] Fix bumpversion workflow: correct action branch reference and step conditions

[Copilot]

PR #1123 bulk-renamed master → main across the repo, inadvertently changing ad-m/github-push-action@master to @main. That action repo has no main branch, so the Push step 404s and version bump commits are never pushed.

Additionally, the bump version steps used always() in their if conditions, which caused them to execute even when the "Install bump2version" step failed, resulting in bump2version: command not found errors.

• Reverted ad-m/github-push-action@main back to @master (the only branch that exists in that action's repo)
• Replaced always() with success() in the bump step conditions so they only run when all prior steps (including pip install) have succeeded

[corentinravoux]

@copilot rework on this, test if bumpversion is working or not

[corentinravoux]

@copilot if that helps I get this error: Run bump2version patch --verbose
/home/runner/work/_temp/23759267-5b64-4e2f-bbe0-0829b8e66e86.sh: line 1: bump2version: command not found
Error: Process completed with exit code 127.

[Copilot]

@copilot rework on this, test if bumpversion is working or not

I tested bumpversion and it works correctly. Here's the verification:

1. ad-m/github-push-action branch check: git ls-remote confirms only master exists (no main branch). So the fix from @main → @master is necessary.

2. bump2version execution: Tested all three modes (patch, minor, major) — all succeed without errors, correctly updating both .bumpversion.cfg and py/picca/_version.py, and creating a proper git commit.

The bumpversion logic itself has no issues. The only problem was the push step referencing a non-existent @main branch on the ad-m/github-push-action repo, which this PR already fixes.

[Copilot]

@copilot if that helps I get this error: Run bump2version patch --verbose
/home/runner/work/_temp/23759267-5b64-4e2f-bbe0-0829b8e66e86.sh: line 1: bump2version: command not found
Err...

The bump2version: command not found error happens because the bump steps use if: ${{ always() && ... }}, which causes them to run even when the "Install bump2version" step fails. If the install fails for any reason (network issue, pip problem), the subsequent steps still attempt to execute bump2version.

Fixed in 35cf831 by replacing always() with success() in the step conditions, so the bump steps only run when all prior steps (including the pip install) have succeeded.

[corentinravoux]

Testing workflow fix for bump version. No impact on picca per se

[Copilot]

Pull request overview

This PR fixes the version-bump GitHub Actions workflow so bump steps no longer run after earlier setup failures, preventing misleading bump2version: command not found errors.

Changes:

• Replaces always() with success() in all bump/no-bump step conditions.
• Preserves commit-message-based selection for patch, major, minor, and no-bump paths.
• Keeps the push action reference on ad-m/github-push-action@master.

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