Support readonly docker filesystem

[mooreds]

Support readonly docker filesystem

Problem

I want to run the FusionAuth docker image with a readonly filesystem, but I can't. FusionAuth fails to start up, I see a message like:

sed: couldn't open temporary file /opt/openjdk/conf/security/sedxxx: Read-only file system

Solution

Allow me to set readOnlyRootFilesystem: true on my docker image. Maybe do any editing in the first stage?

Alternatives/workarounds

• Edit the start.sh file to not modify ${JAVA_DIR}/current/conf/security/java.security as it currently does.
• Build a custom docker image?

Additional context

Came out of https://github.com/FusionAuth/fusionauth-containers/issues/87 , reported by @GlebKuzmich

This behavior began in 1.37.

Looks related to https://github.com/FusionAuth/fusionauth-issues/issues/1814

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