Add RELEASE.md integration and release testing doc

The intent is for us to have a uniform and rigorous release testing
process to minimise the chances of bad releases sneaking into production.

Also add `solbuild` to .gitignore

Signed-off-by: Rune Morling <[email protected]>

.gitignore

@@ -1,2 +1,3 @@
 /bin/
 /pkg/
+solbuild

RELEASE.md

@@ -0,0 +1,33 @@
+# Cutting a Release
+
+To ensure that we have a uniform release process, the current recommendation is to tag the release, then do the following integration tests below.
+
+The idea is to thoroughly exercise commands, flags and known pain points re. package fetching before builds.
+
+## Integration tests
+
+- `git switch master && git pull && git switch the-the-new-tag && go build` (does the new release build from its tag commit?)
+- `alias soltest="sudo $PWD/solbuild" && command -v soltest` (ensure we have a convenient full path to the item under test)
+- `soltest dc -d -i` (delete cache and existing solbuild images on the default unstable profile)
+- `soltest init -d -u -p unstable-x86_64` (initialise Unstable profile)
+- `soltest dc -n -i -p main-x86_64` (delete cache and existing solbuild images on the stable Shannon profile)
+- `soltest init -n -u -p main-x86_64` (initialise Shannon profile)
+- `sudo rm -rvf /var/lib/solbuild/local/*` (delete local repo packages)
+- `gotosoluspkgs && gotopkg zlib && soltest build -n -p main-x86_64 > zlib-stable.log` (build zlib using the stable profile w/no color output)
+- `soltest -d -n chroot -p main-x86_64` (chroot into the stable build built above)
+- `soltest build -d && sudo cp zlib*eopkg /var/lib/solbuild/local/ && soltest index /var/lib/solbuild/local` (buuild unstable zlib w/debug option and copy to build to local repo)
+- `soltest index -d -n /var/lib/solbuild/local/` (create an eopkg index in the local profile dir)
+
+## Packaging tests
+
+After the above integration testing has been completed, build the following packages with the `soltest` alias defined above:
+
+- zsh, giflib and glew (they all use SourceForge mirrors, which can be a bit ... "particular")
+- android-tools (exercises git-submodule functionality)
+
+## Land the newly cut and tagged solbuild release in -unstable
+
+Assuming all of the above packages build successfully, proceed to bump and update the solbuild package.yml on -unstable.
+
+The release manager should then use the repository version to do a quick smoketest for zlib on both main-x86_64 profile and default profile,
+using the `go-task` aliases.