* fix: Source `VERSION` from image ENV
Now CI builds triggered from tagged releases will always have the correct version. No need for manually updating a separate file.
* fix: Query latest GH release tag
Compare to the remote GH release tag published, rather than contents of a `VERSION` file.
`VERSION` file remains in source for now as prior releases still rely on it for an update notification.
* chore: Switch from `yq` to `jaq`
- Can more easily express a string subslice.
- Lighter weight: 9.3M vs 1.7M.
- Drawback, no YAML input/output support.
If `yq` is preferred, the `v` prefix could be removed via BASH easily enough.
* chore: Add entry to `CHANGELOG.md`
* ci: `VERSION` has no relevance to `:edge`
* docs: Update build guide + simplify `make build`
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Co-authored-by: Georg Lauterbach <44545919+georglauterbach@users.noreply.github.com>
