Generalized release script, added release notes

ci/release_notes.md

@@ -0,0 +1,33 @@
+# Initial Release
+
+This is the initial release of git-multibranch-resource, a resource for
+testing multiple branches of a git repository in a single pipeline.
+
+## Functionality
+
+By using `branches` instead of `branch` in the source configuration, you specify a
+regular expression patter of the branches you want to target.  Optionally, if
+you specify `ignore_branches`, you can set a similar pattern for branches that
+you want to ommit (takes precidence over `branches`)
+
+## Everythings better with redis
+
+If you use the optional redis extension, you will reap the following benefits:
+* The ref space will not be cluttered with all the latests refs for all other
+  branches.
+  * Normally  the first ref listed is the ref for that ci run, will all the
+    other refs used to track what branch refs have already been tested.  With
+    redis available, this extra information is stored in redis.
+* No branch update will be untested.
+  * If you have enough workers, this isn't usually a problem.  But if it is,
+    the check will be prevented from reporting another branch's latest ref
+    until a worker is available.  This prevents branches from being skipped by
+    a later reported ref of another branch.
+
+## ToDo
+
+Features of future releases includes:
+* The wait until worker available feature should continue checking if there's
+  an update for the pending branch and report updates for that branch, but no
+  others.
+

ci/scripts/release

@@ -11,7 +11,7 @@
 
 set -eu
 
-if [[ ! -f git/ci/release_notes.md ]]; then
+if [[ ! -f ${REPO_ROOT}/ci/release_notes.md ]]; then
   echo >&2 "ci/release_notes.md not found.  Did you forget to write them?"
   exit 1
 fi