ci: auto-bump README version pin via release-please

[venkatamutyala]

What

Makes release-please keep the README usage example pinned to the current exact version automatically, instead of bumping it by hand.

• release-please-config.json — add an extra-files generic updater for README.md:

  "extra-files": [
    { "type": "generic", "path": "README.md" }
  ]

• README.md — pin to @v6.0.0 (current latest) and add the marker:

  uses: GlueOps/github-actions-opentofu-continuous-delivery@v6.0.0 # x-release-please-version

• release-please.yml — add issues: write (release-please uses it for label management; prevents intermittent labeling failures).

Effect

From the next release on, the release PR rewrites the README pin in-band (e.g. @v6.0.0 → @v6.1.0) alongside the changelog/manifest. No more manual feat: version-bump commits, and consumers always copy a current exact pin.

Deliberately no floating major tag — exact pins match this repo's supply-chain posture (the alternative considered, a moving @v6, was rejected for that reason).

Verify on first release

The generic updater matches the 6.0.0 semver portion and preserves the @v prefix. Worth eyeballing the first release PR after this merges to confirm it produces @v6.1.0 (correct) and not a dropped v or wrong component.

Note

This is ci: (release tooling), so it won't itself cut a release — it takes effect on the next feat:/fix: release PR.

[github-actions]

⬇️ Download the full plan (tofu-plan.txt): https://github.com/GlueOps/github-actions-opentofu-continuous-delivery/actions/runs/28248242654/artifacts/7909632078

OpenTofu Plan

Show plan

OpenTofu used the selected providers to generate the following execution
plan. Resource actions are indicated with the following symbols:
  + create

OpenTofu will perform the following actions:

  # null_resource.integration_test will be created
  + resource "null_resource" "integration_test" {
      + id = (known after apply)
    }

Plan: 1 to add, 0 to change, 0 to destroy.

Changes to Outputs:
  + ok = "integration-test"