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This addresses #10, providing support for publishing *preview* releases based off feature branches, ie PRs. The UX of doing a preview release is very similar to the existing process for doing a full release (https://github.com/guardian/gha-scala-library-release-workflow/blob/main/docs/making-a-release.md), with only these differences: * The developer needs to select the PR branch before clicking the green `Run workflow` button * The version number will be the **upcoming** version number, but with a suffix that clearly indicates this is a preview release, eg: `1.0.7-PREVIEW.feature1.2024-01-04T1230.42ed11d4`. Note that this is _not_ a `-SNAPSHOT` release, the workflow does not support `SNAPSHOT` releases. * No branches are updated by the release (ie, not the PR's feature branch, and not the default `main` branch) - the preview release commit exists as its own tagged commit, taking the latest PR commit as its parent. * GitHub release notes will not be created, but instead the PR using that branch will be updated with a comment providing details of the new release (version number, etc). Internally, these 'preview release' changes take place if a non-default branch (ie a feature branch, not `main`) is used: * The `🔒 Init` job `release_type` output is `PREVIEW_FEATURE_BRANCH` rather than `FULL_MAIN_BRANCH` * Only 1 commit is pushed by the workflow, rather than 2, and _not_ onto the branch - the single commit exists as a tagged leaf to the side of the PR branch. The 2nd commit normally needed by the full release process (incrementing the version number and adding the `-SNAPSHOT` suffix) is not needed for preview releases - there are already enough details in the `-PREVIEW` version-suffix to keep preview releases unique, even if you do many releases for 1 commit in 1 PR. * When that 1 commit is pushed, it's initially pushed with a _disposable_ Git tag - not the _release_ tag. Pushing _any_ commit requires either a branch or tag for the `git push` command to work on (you can't just push a commit id - I've tried), and there is no pre-existing suitable branch (we don't want to modify the PR feature branch) or tag (the release tag has an annotation message including the hashes of all artifact files generated by the release, and at the point when the commit is pushed, those artifacts & their hashes are not available yet), so we have to use a new, different, disposable, Git tag instead. ## Choice of version-suffix for preview releases https://semver.org/#spec-item-9 says: > 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--. > > 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD. ### How can we prevent tooling from thinking our preview releases are stable releases? If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them. * IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview' * Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc * Scaladex uses PreRelease.scala - scalacenter/scaladex#614 Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number: * 'PREVIEW' * a commit hash of at least 8 characters ## Problems with backticks Ideally we would be generating a markdown message for the PR comment with lots of backticks for styling: https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks ...like this: rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment) ...but they get interpreted by BASH, and cause trouble... https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058 ...so for the time being this PR avoids them in the generated PR comment.
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