Created Raspberry Pi 4 (markdown)

Raspberry-Pi-4.md

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+NOTE: This may apply for older Raspberry Pi's as well.
+
+# Docker
+
+You may see the following error appear:
+
+```
+ytdlt-db-1  | 
+ytdlt-db-1  | WARNING: MongoDB 5.0+ requires ARMv8.2-A or higher, and your current system does not appear to implement any of the common features for that!
+ytdlt-db-1  |   see https://jira.mongodb.org/browse/SERVER-55178
+ytdlt-db-1  |   see also https://en.wikichip.org/wiki/arm/armv8#ARMv8_Extensions_and_Processor_Features
+ytdlt-db-1  |   see also https://github.com/docker-library/mongo/issues/485#issuecomment-970864306
+ytdlt-db-1  | 
+ytdlt-db-1 exited with code 132
+
+```
+
+MongoDB's latest Docker image does not support Raspberry Pi 4.
+
+The workaround is to set the MongoDB version in the docker-compose to `4.4.6` like so:
+
+```
+image: mongo:4.4.6
+```
+
+So your full docker-compose.yml may look like this:
+
+```
+version: "2"
+services:
+    ytdl_material:
+        environment: 
+            ALLOW_CONFIG_MUTATIONS: 'true'
+            ytdl_mongodb_connection_string: 'mongodb://ytdl-mongo-db:27017'
+            ytdl_use_local_db: 'false'
+            write_ytdl_config: 'true'
+        restart: always
+        volumes:
+            - ./appdata:/app/appdata
+            - ./audio:/app/audio
+            - ./video:/app/video
+            - ./subscriptions:/app/subscriptions
+            - ./users:/app/users
+        ports:
+            - "8998:17442"
+        image: tzahi12345/youtubedl-material:latest
+    ytdl-mongo-db:
+        image: mongo:4.4.6
+        ports:
+            - "27017:27017"
+        logging:
+            driver: "none"          
+        container_name: mongo-db
+        restart: always
+        volumes:
+            - ./db/:/data/db
+```
+
+## References
+
+* https://github.com/Tzahi12345/YoutubeDL-Material/issues/614#issuecomment-1142216713
+* https://jira.mongodb.org/browse/DOCS-14684
+* https://github.com/docker-library/mongo/issues/485
+* https://www.mongodb.com/community/forums/t/mongodb-5-0-cpu-intel-g4650-compatibility/116610
+* https://www.mongodb.com/community/forums/t/core-dump-on-mongodb-5-0-on-rpi-4/115291