Adapt MongoDB related environment variable to support Microcks 1.15

[lbroudoux]

Following the migration from Spring Boot 3 to Spring Boot 4 in Microcks 1.1.5, we discovered (see microcks/microcks#2053 (comment)) that the MongoDB-related environment variables to manage the connection have changed from SPRING_DATA_MONGODB_* to SPRING_MONGODB_*.

We must adapt the Deployment configuration generated by the Operator, but only if the user asked for installation of nightly or >1.14.* version of the Microcks image. We must also manage the case where people are using the container image hash and we have no information on actual version of the Microcks image.

[lbroudoux]

After some thinking, I ended up with the following algorithm considering the spec.version and the spec.microcks.image.tag informations we have in the Microcks custom resource:

In order of precedence, here's how the things are resolved:

1. We check if spec.version == nightly, then we'll use the new SPRING_MONGODB_* env variables and exit. We'll continue otherwise.
2. Then, we try to parse spec.version and if (major == 1 && minor >= 15) || major >= 2) then we'll use the new SPRING_MONGODB_* env variables, else we'll stick with SPRING_DATA_MONGODB_*. If we catch a parsing error, we'll continue.
3. Then, we try to parse spec.microcks.image.tag if provided and if (major == 1 && minor >= 15) || major >= 2) then we'll use the new SPRING_MONGODB_* env variables, else we'll stick with SPRING_DATA_MONGODB_*. If we catch a parsing error, we'll continue to the default
4. The default will be to use the new SPRING_MONGODB_* env variables from Operator version 0.0.10.

So, for people using digest to pin images, you'll have the ability to still set spec.version and the spec.microcks.image.tag to the correct Microcks version to get env variables matching to your real version.

What do you think?

[Git-HimanshuRathi]

@lbroudoux, the algorithm looks correct. One edge case worth noting: a version like 1.14-SNAPSHOT (pre-release suffix on the minor segment) would fail parseInt, fall through all steps, and default to new names, which would be wrong. Unlikely in production, but worth a comment in the code.

Also worth checking spec.microcks.image.tag == "nightly" explicitly in step 1, even though it correctly falls through to the default today just makes the intent clearer to future readers.