Adding testing isle-buildkit doc (#212)

docs/maintainers/testing_process.md

@@ -0,0 +1,55 @@
+#### isle-buildkit testing
+
+When testing isle-buildkit image releases or possible changes, a tester can:
+
+* clone down the latest `isle-dc` to their local laptop / workstation
+  * `git clone https://github.com/Islandora-Devops/isle-dc.git`
+
+* Look up the last commit hash in the PR on the isle-buildkit Github.com PR page. 
+  * In this example - we'll be using this PR [Allow containers to run without allocating a tty.](https://github.com/Islandora-Devops/isle-buildkit/commits/issue-174) and the value `79de15828971c10894c3cdf14eec431434c457ea` which is both the commit hash and the resulting [Docker image](https://hub.docker.com/u/islandora) / tag needed for testing.
+  * In the image below one would click the overlapping squares icon to copy the full SHA of the commit.
+
+**Example**
+
+![Screenshot from 2022-04-28 15-00-42](https://user-images.githubusercontent.com/501554/165828803-088d6fe6-e9cf-4238-8cfe-d697fac64ef4.png)
+
+Within the newly cloned `isle-dc` project
+* Copy the `sample.env` to `.env` as you'll need to edit the TAG value for testing
+  * `cp sample.env .env`
+* Change **Line 65** within the new `.env` file to the test commit hash from above
+  * `nano / vi .env`
+  * e.g. `TAG=79de15828971c10894c3cdf14eec431434c457ea`
+
+* Follow the instructions from the isle-dc [Getting Started](https://github.com/Islandora-Devops/isle-dc#getting-started) section and run the following
+  * `make demo`
+
+* QC the resulting site at [https://islandora.traefik.me](https://islandora.traefik.me)
+  * Ensure that there aren't new errors in the Status page
+  * If additional testing parameters are called out in the ticket, review and test.
+
+* If everything passes or doesn't, update the PR / issue with the following style of response.
+
+```bash
+#### Test Environment
+
+* OS: Ubuntu 20.04 LTS Desktop
+* CPU: Intel i7-10510U (8 cores) @ 4.900 GHZ
+* RAM: 32 GB
+
+---
+
+#### Steps taken to test
+
+ * `git clone [email protected]:Islandora-Devops/isle-dc.git`  to local laptop
+ * `cd isle-dc`
+ * `cp sample.env .env`
+ * `vi / nano .env`
+    * Changed `TAG=` to `TAG=79de15828971c10894c3cdf14eec431434c457ea`
+ * `make demo`
+---
+
+#### Results
+
+Status = Working
+@nigelgbanks @g7morris Process worked great. No errors to report.
+```