add Glassfish4-to-Payara5 upgrade instructions to Dataverse 5 release notes

doc/release-notes/6961-payara-upgrade.md

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+Upgrade Dataverse from Glassfish 4.1 to Payara 5
+================================================
+
+The instruction below describes the upgrade procedure based on moving an existing glassfish4 domain directory under Payara. We recommend this method, instead of setting up a brand-new Payara domain using the installer because it appears to be the easiset way to recreate your current configuration and preserve all your data. 
+
+Download Payara, v5.2020.2 as of this writing:
+
+	# curl -L -O https://github.com/payara/Payara/releases/download/payara-server-5.2020.2/payara-5.2020.2.zip
+	# sha256sum payara-5.2020.2.zip 
+	  1f5f7ea30901b1b4c7bcdfa5591881a700c9b7e2022ae3894192ba97eb83cc3e
+
+Unzip it somewhere (/usr/local is a safe bet)
+
+	# sudo unzip payara-5.2020.2.zip -d /usr/local/
+
+Copy the Postgres driver to /usr/local/payara5/glassfish/lib
+
+	# sudo cp /usr/local/glassfish4/glassfish/lib/postgresql-42.2.9.jar /usr/local/payara5/glassfish/lib/
+
+Move payara5/glassfish/domains/domain1 out of the way
+
+	# sudo mv /usr/local/payara5/glassfish/domains/domain1 /usr/local/payara5/glassfish/domains/domain1.orig
+
+Undeploy the Dataverse web application (if deployed; version 4.20 is assumed in the example below)
+
+	# sudo /usr/local/glassfish4/bin/asadmin list-applications
+	# sudo /usr/local/glassfish4/bin/asadmin undeploy dataverse-4.20
+
+Stop Glassfish; copy domain1 to Payara
+
+	# sudo /usr/local/glassfish4/bin/asadmin stop-domain
+	# sudo cp -ar /usr/local/glassfish4/glassfish/domains/domain1 /usr/local/payara5/glassfish/domains/
+
+Remove the Glassfish cache directories
+
+	# sudo rm -rf /usr/local/payara5/glassfish/domains/domain1/generated/
+	# sudo rm -rf /usr/local/payara5/glassfish/domains/domain1/osgi-cache/
+
+In domain.xml:
+=============
+
+Replace the -XX:PermSize and -XX:MaxPermSize JVM options with -XX:MetaspaceSize and -XX:MaxMetaspaceSize.
+
+        <jvm-options>-XX:MetaspaceSize=256m</jvm-options>
+        <jvm-options>-XX:MaxMetaspaceSize=512m</jvm-options>
+
+Set both Xmx and Xms at startup to avoid runtime re-allocation. Your Xmx value should likely be higher: 
+
+	<jvm-options>-Xmx2048m</jvm-options>
+	<jvm-options>-Xms2048m</jvm-options>
+
+Add the below JVM options beneath the -Ddataverse settings:  
+
+	<jvm-options>-Dfish.payara.classloading.delegate=false</jvm-options>
+	<jvm-options>-XX:+UseG1GC</jvm-options>
+	<jvm-options>-XX:+UseStringDeduplication</jvm-options>
+	<jvm-options>-XX:+DisableExplicitGC</jvm-options>
+
+Change any full pathnames /usr/local/glassfish4/... to /usr/local/payara5/... or whatever it is in your case. (Specifically check the -Ddataverse.files.directory and -Ddataverse.files.file.directory JVM options)
+
+In domain1/config/jhove.conf, change the hard-coded /usr/local/glassfish4 path, as above.
+
+(Optional): If you renamed your service account from glassfish to payara or appserver, update the ownership permissions:
+
+	# sudo chown -R payara /usr/local/payara5/glassfish/domains/domain1
+	# sudo chown -R payara /usr/local/payara5/glassfish/lib
+
+You will also need to check that the new user has write permission on the files directory, if they are located outside the old Glassfish domain. And/or make sure the new user account has the correct AWS credentials, if you are using S3 for storage. 
+
+Finally, start Payara:
+
+	# sudo -u payara /usr/local/payara5/bin/asadmin start-domain
+
+Deploy the Dataverse 5 warfile:
+
+	# sudo -u payara /usr/local/payara5/bin/asadmin deploy /path/to/dataverse-5.0.war
+
+Then restart Payara:
+
+	# sudo -u payara /usr/local/payara5/bin/asadmin stop-domain
+	# sudo -u payara /usr/local/payara5/bin/asadmin start-domain
+