Moved initial ci databases to specific docker-compose file

.travis.yml

@@ -24,10 +24,8 @@ install:
   - composer install --no-interaction --prefer-dist
 
 before_script:
-  - docker-compose up -d shlink_db shlink_db_postgres shlink_db_maria shlink_db_ms
-  - docker-compose exec shlink_db mysql -u root -proot -e "CREATE DATABASE shlink_test"
-  - docker-compose exec -e PGPASSWORD=root shlink_db_postgres psql -U postgres -c 'create database shlink_test;'
-  - docker-compose exec shlink_db_maria mysql -u root -proot -e "CREATE DATABASE shlink_test"
+  - docker-compose -f docker-compose.yml -f docker-compose.ci.yml up -d shlink_db_ms shlink_db shlink_db_postgres shlink_db_maria
+  - sleep 10 # Let MS database start-up before trying to interact with it
   - docker-compose exec shlink_db_ms /opt/mssql-tools/bin/sqlcmd -S localhost -U sa -P 'Passw0rd!' -Q "CREATE DATABASE shlink_test;"
   - mkdir build
   - export DOCKERFILE_CHANGED=$(git diff ${TRAVIS_COMMIT_RANGE:-origin/master} --name-only | grep Dockerfile)

docker-compose.ci.yml

@@ -0,0 +1,14 @@
+version: '3'
+
+services:
+    shlink_db:
+        environment:
+            MYSQL_DATABASE: shlink_test
+
+    shlink_db_postgres:
+        environment:
+            POSTGRES_DB: shlink_test
+
+    shlink_db_maria:
+        environment:
+            MYSQL_DATABASE: shlink_test