docker: add mssql block

docker/blocks/mssql/Dockerfile

+FROM microsoft/mssql-server-linux:latest
+WORKDIR /usr/setup
+COPY . /usr/setup
+RUN chmod +x /usr/setup/setup.sh
+CMD /bin/bash ./entrypoint.sh
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docker/blocks/mssql/docker-compose.yaml

+  mssqltest:
+    build:
+      context: blocks/mssql
+    environment:
+      ACCEPT_EULA: Y
+      MSSQL_SA_PASSWORD: Password!
+      MSSQL_PID: Express
+    ports:
+      - "1433:1433"
+
+  fake-mssql-data:
+    image: grafana/fake-data-gen
+    network_mode: bridge
+    environment:
+      FD_DATASOURCE: mssql
+      FD_PORT: 1433
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docker/blocks/mssql/entrypoint.sh

+#start SQL Server and run setup script
+/usr/setup/setup.sh & /opt/mssql/bin/sqlservr
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docker/blocks/mssql/setup.sh

+#/bin/bash
+
+#wait for the SQL Server to come up
+sleep 20s
+/opt/mssql-tools/bin/sqlcmd -S localhost -U sa -P Password! -d master -i /usr/setup/setup.sql
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docker/blocks/mssql/setup.sql

+CREATE LOGIN grafana WITH PASSWORD = 'Password!'
+GO
+
+CREATE DATABASE grafana;
+GO
+
+USE grafana;
+GO
+
+CREATE USER grafana FOR LOGIN grafana;
+GO
+
+EXEC sp_addrolemember 'db_owner', 'grafana';
+GO