Add "apk upgrade" to Dockerfile, add .dockerignore #351
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See https://github.com/folio-org/folio-tools/tree/master/folio-java-docker/openjdk21
Purpose
Upgrade Alpine packages to apply security patches.
Speed up Docker build by excluding unneeded files.
Approach
Add "apk upgrade" to Dockerfile, add .dockerignore
Pre-Merge Checklist:
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