switch to docker-compose for SQL Server

simplifies run-tests.sh and will make it easier
to spin up other testing databases in the future.

docker-compose.yml

@@ -0,0 +1,17 @@
+version: '2'
+services:
+  mysql:
+    image: percona:5.7
+    environment:
+      - MYSQL_ROOT_PASSWORD
+    ports:
+      - "3306:3306"
+    command:
+      [--character-set-server=utf8mb4, --collation-server=utf8mb4_unicode_ci]
+  sqlserver:
+    image: mcr.microsoft.com/mssql/server:2019-GA-ubuntu-16.04
+    environment:
+      ACCEPT_EULA: Y
+      SA_PASSWORD: Str0ngP4ssw0rd
+    ports:
+      - "1433:1433"

run-tests.sh

@@ -1,23 +1,15 @@
 #!/bin/sh
 
-if test "$1" = "run"
-then
-	docker run -e ACCEPT_EULA=Y -e SA_PASSWORD=Str0ngP4ssw0rd \
-		-p 1433:1433 --name sql-server19 \
-		-d mcr.microsoft.com/mssql/server:2019-GA-ubuntu-16.04
-fi
-if test "$1" = "rm"
-then
-	docker container rm sql-server19
-fi
-if test "$1" = "start"
-then
-	docker container start sql-server19
-fi
-if test "$1" = "stop"
-then
-	docker container stop sql-server19
-fi
+# start databases with: docker-compose up
+# then: ./run-tests.sh create
+# - creates a new database in MySQL for running tests
+#
+# test against "all" databases with MySQL JDBC driver:
+# ./run-tests.sh
+#
+# test against "all" databases with MariaDB JDBC driver:
+# ./run-tests.sh maria
+
 if test "$1" = "create"
 then
 	# assumes you already have a MySQL instance running locally