Add RELEASE-PROCESS.md

The document describes the release process for NGINX Unit.

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

RELEASE-PROCESS.md

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+This document describes the release process for NGINX Unit and as such is
+likely only of interest to NGINX Unit maintainers.
+
+# Create a preparatory branch
+
+You should create a new branch for doing this work. E.g.
+
+    $ git checkout -b x.y[.z]-prep master
+
+
+# Create a set of commits
+
+## unitctl
+
+Create a commit that updates the version of tools/unitctl. There are a
+few places where this needs updating, find them with
+
+    $ grep -rn x.y.z tools/unitctl/
+
+See 3144710fe for an example.
+
+## unit-openapi.yaml
+
+Create a commit that updates the version in docs/unit-openapi.yaml
+
+See: <T.B.C> for an example.
+
+## Dockerfiles
+
+Create a commit that generates new dockerfiles.
+
+    $ cd pkg/docker
+    $ make clean
+    $ make dockerfiles
+
+    $ git rm/add as required
+
+See f7771378f for an example.
+
+## changes.xml
+
+Create a commit that updates the docs/changes.xml for this release.
+
+As well as adding the various entries also update the 'date' and 'time'
+fields.
+
+## Generate the CHANGES file
+
+    $ make -C docs/ changes && mv build/CHANGES .
+
+See 24ed91f40 for an example.
+
+
+# Merge it
+
+These should be the last commits into the repository before the release
+is tagged.
+
+
+# Tag the release
+
+Once the above has been merged you can tag it with the new version. For
+this we create an annotated tag. E.g. On master
+
+    $ git tag -a -m "Unit 1.33.0 release." 1.33.0
+
+This should create a new tag object pointing to the "CHANGES" commit.
+
+The tag can be pushed just as the branch is. E.g.
+
+    $ git push <upstream> 1.33.0
+
+
+# Tarball
+
+We need to publish an archive of the source and a checksum.
+
+    $ cd pkg
+    $ make dist
+    $ rsync -tv unit-X.Y.Z.tar.* dev:/data/www/unit.nginx.org/download/
+
+
+# Docs
+
+The unit-docs repository needs a copy of CHANGES under
+source/CHANGES.txt
+
+
+# Post release
+
+Immediately after release we should bump the version of Unit by editing
+the version file and docs/changes.xml to add a new changes header
+
+See e67d74332 for an example.