feat(jans-linux-setup): Gluu CE to Flex migration script

Signed-off-by: Mustafa Baser <[email protected]>

jans-linux-setup/tools/gluu2flex-migration/README.md

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+# Gluu to Flex Migration
+
+## 1. Inside Gluu 4.x container:
+
+   1.1 Download Janssen archieve: `wget https://github.com/JanssenProject/jans/archive/refs/heads/jans-linux-setup-gluu2flex-migration.zip`
+
+   1.2 Extract archieve: `unzip jans-linux-setup-gluu2flex-migration.zip`
+
+   1.3 Execute script: `python3 jans-jans-linux-setup-gluu2flex-migration/jans-linux-setup/tools/gluu2flex-migration/gluu2flex.py`
+
+   1.4 You need do copy directory `jans-jans-linux-setup-gluu2flex-migration/jans-linux-setup/tools/gluu2flex-migration`
+       to target Janssen instance, thus make tarball:
+       `tar -zcf gluu_source.tgz jans-jans-linux-setup-gluu2flex-migration/jans-linux-setup/tools/gluu2flex-migration`
+
+## 2. Install Jannsen instance (on a fresh VM):
+
+   2.1 Get `gluu_source.tgz` file you created in Step-1.4, and extract: `tar -zxf gluu_source.tgz`
+
+   2.2 You need salt, so `cat jans-jans-linux-setup-gluu2flex-migration/jans-linux-setup/tools/gluu2flex-migration/migration_source/data.json`
+
+   2.3 Download Janssen installer: `wget https://raw.githubusercontent.com/JanssenProject/jans/main/jans-linux-setup/jans_setup/install.py`
+
+   2.4 Install a fresh Janssen Instance with salt of Gluu Instance, for example: `python3 install.py --args="-encode-salt=0xZ6nwAjvZlz8nOovDIZFSJT"`
+      NOTE!!: Replace your salt
+
+   2.6 Copy source directory to setup directory:
+      `cp -r jans-jans-linux-setup-gluu2flex-migration/jans-linux-setup/tools/gluu2flex-migration/ /opt/jans/jans-setup/tools`
+   2.5 Execute migratin script: `python3 /opt/jans/jans-setup/tools/gluu2flex-migration/gluu2flex.py`