Add bump_major support for chart version bumps when webhook minor version increases

[Copilot]

Issue:

Port of rancher/turtles@7884d64

Problem

When releasing a new webhook minor version (e.g., v0.5.0 → v0.6.0-rc.0), the chart major version needs to be bumped (e.g., 104.0.0 → 105.0.0). The existing release scripts only support patch version bumps.

Solution

Added bump_major parameter to release workflows and scripts:

• .github/workflows/release-charts.yaml / release-rancher.yaml: Added bump_major workflow input (choice: true/false)
• .github/workflows/scripts/release-against-charts.sh / release-against-rancher.sh:
  • Added bump_major() function (increments major, resets minor/patch to 0)
  • Added minor version detection logic using cut -d. -f2 for simplified extraction
  • bump_major is now a required argument (must be "true" or "false")
  • Script errors if minor version increases without bump_major=true
  • Informative commit messages indicating bump type

Usage examples from updated script help:

RC to RC:        ./release-against-charts.sh ./charts v0.5.0-rc.0 v0.5.0-rc.1 false
RC to stable:    ./release-against-charts.sh ./charts v0.5.0-rc.0 v0.5.0 false
stable to RC:    ./release-against-charts.sh ./charts v0.5.0 v0.5.1-rc.1 false
new minor RC:    ./release-against-charts.sh ./charts v0.5.0 v0.6.0-rc.0 true   # bump chart major

CheckList

• Test - Shell syntax validated; YAML syntax validated; no functional tests needed (workflow dispatch scripts)
• Docs - Usage examples added to script headers

Original prompt

Bring the changes from rancher/turtles@7884d64 to our repository.

Both repositories have the same GHA defined, but the turtles one include a fix.

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