LINDAT/Make Solr heap tunable via SOLR_HEAP (backport #1309)

[jr-rk]

Problem

The Solr heap in docker/docker-compose-rest.yml is hardcoded to -m 4g. With
-XX:+AlwaysPreTouch the container commits the full 4 GB on start — wasteful on shared dev
hosts running several DSpace stacks, and not lowerable without editing a tracked file.

Backport of #1309 to customer/lindat.
Tracking issue: dataquest-dev/dspace-customers#746

Change set

Single-line change to the dspacesolr entrypoint in docker/docker-compose-rest.yml:

-      exec solr -p 8983 -f -m 4g
+      exec solr -p 8983 -f -m "${SOLR_HEAP:-4g}"

Translated, not cherry-picked (per the FE backport model). On this branch (7.6.5 family) the Solr launch uses -p 8983,
so only the -m 4g argument changed; the port and every other line are untouched. The value
is quoted to survive word-splitting, matching the source PR follow-up.

Out of scope: the default heap value (stays 4g), other services, ports, Solr image/version,
and AlwaysPreTouch.

Test evidence

• Post-change marker present (line 178): -m "${SOLR_HEAP:-4g}"
• Pre-change marker -m 4g no longer present (grep count 0)
• Compose YAML re-parses cleanly (yaml.safe_load); edit sits inside the entrypoint scalar
• Default/override: SOLR_HEAP unset -> 4g, SOLR_HEAP=1g -> 1g

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[jr-rk]

PR closed due to redundancy - original PR (root/source) is made to dtq-dev -> which means lindat.