fix(certs): update generate-dev-certs.sh

[mwangggg]

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Fixes: #421

Description of the change:

• use JAVA_HOME variable instead of hard-coded java openjdk path
• cleanup existing keystore file when user generates new keystore pass
• check if truststore folder exists before generating truststore file

[andrewazores]

Just curious - have you been using this script along with developing the Agent HTTPS keystore piece? I'm curious what you do with these generated certs. The script long predates the auth proxy setup, and used to be used back when Cryostat itself was directly exposed to traffic and needed to allow TLS termination, like what 2.4 does. Now that Cryostat is hidden behind the auth proxy, it's the auth proxy that must be configured to use such a cert.

[andrewazores]

Is this still needed or does #426 replace it?

[mwangggg]

426 replaces it :+1: