feat(database): add mysql and postgresql version arguments (#296)

related to camunda/camunda-bpm-platform#2692

Dockerfile

@@ -13,6 +13,9 @@ ARG MAVEN_PROXY_PORT
 ARG MAVEN_PROXY_USER
 ARG MAVEN_PROXY_PASSWORD
 
+ARG POSTGRESQL_VERSION
+ARG MYSQL_VERSION
+
 ARG JMX_PROMETHEUS_VERSION=0.12.0
 
 RUN apk add --no-cache \

README.md

@@ -396,6 +396,17 @@ docker build -t camunda-bpm-platform \
   --build-arg MAVEN_PROXY_PASSWORD=${PROXY_PASSWORD} \
   .
 ```
+### Override MySQL and PostgreSQL driver versions. 
+By default, the driver versions are fetched from https://github.com/camunda/camunda-bpm-platform/blob/master/database/pom.xml. That can be overriden by passing `MYSQL_VERSION` and `POSTGRESQL_VERSION` build args
+
+```
+docker build -t camunda-bpm-platform \
+  --build-arg DISTRO=${DISTRO} \
+  --build-arg VERSION=${VERSION} \
+  --build-arg POSTGRESQL_VERSION=${POSTGRESQL_VERSION} \
+  --build-arg MYSQL_VERSION=${MYSQL_VERSION} \
+  .
+```
 
 ## Use cases
 

download.sh

@@ -82,8 +82,12 @@ mvn dependency:get -U -B --global-settings /tmp/settings.xml \
     -DgroupId="org.camunda.bpm" -DartifactId="camunda-database-settings" \
     -Dversion="${ARTIFACT_VERSION}" -Dpackaging="pom" -Dtransitive=false
 cambpmdbsettings_pom_file=$(find /m2-repository -name "camunda-database-settings-${ARTIFACT_VERSION}.pom" -print | head -n 1)
-MYSQL_VERSION=$(xmlstarlet sel -t -v //_:version.mysql $cambpmdbsettings_pom_file)
-POSTGRESQL_VERSION=$(xmlstarlet sel -t -v //_:version.postgresql $cambpmdbsettings_pom_file)
+if [ -z "$MYSQL_VERSION" ]; then
+    MYSQL_VERSION=$(xmlstarlet sel -t -v //_:version.mysql $cambpmdbsettings_pom_file)
+fi
+if [ -z "$POSTGRESQL_VERSION" ]; then
+    POSTGRESQL_VERSION=$(xmlstarlet sel -t -v //_:version.postgresql $cambpmdbsettings_pom_file)
+fi
 
 mvn dependency:copy -B \
     $PROXY \