Improved docker support

Updated README for docker
Cleaned up run and build bash scripts

mysql.env.example

@@ -0,0 +1,20 @@
+# Prefer no and generating a strong password for the root (+ special) user
+MYSQL_ALLOW_EMPTY_PASSWORD="no"
+
+# You can change the db name also for obscurity.
+# Has to be changed in the default.conf and in the global.sql init file then also.
+MYSQL_DATABASE="global"
+
+# Beware: if not using root user, the database 'global' requires granting permissions for that user
+# Root user is created automatically so dont provide it here.
+#MYSQL_USER="dbuser"
+#MYSQL_PASSWORD="CHANGEMEIFNOTUSINGROOTANDINGLOBALCONF"
+
+# Comment this out if you are using random root pw (below).
+MYSQL_ROOT_PASSWORD="ALWAYSCHANGEMEHEREANDINGLOBALCONFIFUSINGROOT"
+
+# Or you can use a special non-root db user and generate a random pw for the root user instead.
+# To improve security
+# However, either initial root user access
+# or editing Server/db_exports/global.sql to add grants for 'global' to the special user above.
+MYSQL_RANDOM_ROOT_PASSWORD="no"