dev-integration-tests: update database steps (just use docker)

Signed-off-by: Stephan Renatus <srenatus@chef.io>

Documentation/dev-integration-tests.md

@@ -18,39 +18,28 @@ $ ./scripts/test-k8s.sh
 
 ## Postgres
 
-Running database tests locally require:
+Running database tests locally requires:
 
-* A systemd based Linux distro.
-* A recent version of [rkt](https://github.com/coreos/rkt) installed.
+* Docker
 
-The `standup.sh` script in the SQL directory is used to run databases in containers with systemd daemonizing the process.
+To run the database integration tests:
 
-```
-$ sudo ./storage/sql/standup.sh create postgres
-Starting postgres. To view progress run
-
-  journalctl -fu dex-postgres
+- start a postgres container:
 
-Running as unit dex-postgres.service.
-To run tests export the following environment variables:
+  `docker run --name dex-postgres -e POSTGRES_USER=postgres -e POSTGRES_DB=dex -p 5432:5432 -d postgres:11`
+- export the required environment variables:
 
-  export DEX_POSTGRES_DATABASE=postgres; export DEX_POSTGRES_USER=postgres; export DEX_POSTGRES_PASSWORD=postgres; export DEX_POSTGRES_HOST=172.16.28.3:5432
+  `export DEX_POSTGRES_DATABASE=dex DEX_POSTGRES_USER=postgres DEX_POSTGRES_PASSWORD=postgres DEX_POSTGRES_HOST=127.0.0.1:5432`
 
-```
+- run the storage/sql tests:
 
-Exporting the variables will cause the database tests to be run, rather than skipped.
+  ```
+  $ # sqlite3 takes forever to compile, be sure to install test dependencies
+  $ go test -v -i ./storage/sql
+  $ go test -v ./storage/sql
+  ```
 
-```
-$ # sqlite3 takes forever to compile, be sure to install test dependencies
-$ go test -v -i ./storage/sql
-$ go test -v ./storage/sql
-```
-
-When you're done, tear down the unit using the `standup.sh` script.
-
-```
-$ sudo ./storage/sql/standup.sh destroy postgres
-```
+- clean up the postgres container: `docker rm -f dex-postgres`
 
 ## LDAP