ported double tracking from TC

docker/database/Dockerfile

@@ -0,0 +1,28 @@
+FROM alpine:3.9 as builder
+
+# install bash
+RUN apk add --no-cache bash
+
+# copy the sources from the host machine
+COPY apps /azerothcore/apps
+COPY bin /azerothcore/bin
+COPY conf /azerothcore/conf
+COPY data /azerothcore/data
+COPY deps /azerothcore/deps
+COPY acore.json /azerothcore/acore.json
+
+# run the AzerothCore database assembler
+RUN ./azerothcore/bin/acore-db-asm 1
+
+FROM mysql:5.7
+
+ENV LANG C.UTF-8
+
+# copy files from the previous build stage - see: https://docs.docker.com/develop/develop-images/multistage-build/
+COPY --from=builder /azerothcore/env/dist/sql /sql
+
+# adding the "generate-databases.sh" to the directory "/docker-entrypoint-initdb.d"
+# because all scripts included in that directory will automatically be executed when the docker container starts
+COPY docker/database/generate-databases.sh /docker-entrypoint-initdb.d
+
+HEALTHCHECK --interval=5s --timeout=15s --start-period=30s --retries=3 CMD mysqladmin -uroot -p$MYSQL_ROOT_PASSWORD ping -h localhost