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Emit Tomcat HTTP logs to stdout from Docker

Tomcat emits its own startup and shutdown logs by default, but also
emits HTTP access logs to logs/localhost_access_log.YYYY-MM-DD.txt. This
dynamically rewrites the conf/server.xml file to emit the HTTP logs to
standard output instead.

As mentioned in the update-tomcat-logging-config.sh comment, this
configuration was inspired by:

- https://stackoverflow.com/a/62598943

Got the Perl implementation hint from:

- https://unix.stackexchange.com/a/26289
- https://unix.stackexchange.com/a/181215

Also updates the Dockerfile FROM from tomcat:10.1.16-jdk21-temurin-jammy
to tomcat:10.1.16-jre21-temurin-jammy. The former was 211.56 MB
compressed/454MB uncompressed, the latter 111.28 MB compressed/310MB
uncompressed.

- https://hub.docker.com/layers/library/tomcat/10.1.16-jdk21-temurin-jammy/images/sha256-857b16869bc3c219c88644b9181f03dd5?context=explore
- https://hub.docker.com/layers/library/tomcat/10.1.16-jre21-temurin-jammy/images/sha256-7aaaf9a60d9b78ef9e31f1055f392561a?context=explore

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