Port changes from pie-extensions fork

[hotrush]

Summary

Brings across the work accumulated on pie-extensions/pie-ext-binary-builder to this fork. The old fork is being retired in favour of extport (re-fork rather than transfer), so the 22-commit delta from pie-extensions/main is being applied here as a single merge.

Features ported

• docker-image input + execInDocker helper — build and PHP detection can run inside a container via docker run
• apk-packages input — install extra Alpine packages when building with a Docker image
• parseArgs helper — splits configure-flags safely, honouring quoted args
• musl libc detection / output naming
• Parallel make builds
• Replace-existing-release-asset behaviour on re-upload (instead of erroring)
• Smoke / end-to-end testing workflow (.github/workflows/end-to-end.yml)
• New .github/workflows/release.yml — builds dist/ on release publish and force-updates the major-version tag (e.g. v1)
• dist/ removed from git and added to .gitignore (now built by the release workflow)
• Action runtime bumped node20 → node24
• Test suite extended to cover all of the above (43 tests, all green locally)

Conflict resolution

extport/main already had its own merge of the build-path-option PR. pie-extensions/main has the equivalent change via its own PR. Merge was performed with -X theirs so pie-extensions' version wins where they overlap, matching the intended end state. The dist/index.js and dist/index.js.map modify/delete conflicts were resolved by deleting (pie-extensions removes the committed dist/).

Test plan

• npm install clean
• npm test — 43/43 passing locally
• CI on this branch (test + end-to-end workflows under node24)
• After merge: cut a release (e.g. v1.0.0) to exercise the new release.yml and confirm it commits dist/ to the tag and force-updates v1

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