Add Drone CI pipeline configuration and Docker setup for Jellyfin

.drone.yml

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+kind: pipeline
+type: kubernetes
+name: default
+
+node_selector:
+  physical-node: dev1
+
+trigger:
+  branch:
+    - main
+  event:
+    - push
+workspace:
+  path: /drone/src
+
+steps:
+  - name: build multiarch from dev
+    image: docker.io/owncloudci/drone-docker-buildx:4
+    privileged: true
+    settings:
+      cache-from: [ "registry.dev.format.hu/jellyfin-init-container" ]
+      registry: registry.dev.format.hu
+      repo: registry.dev.format.hu/jellyfin-init-container
+      tags: latest
+      dockerfile: Dockerfile
+      username:
+        from_secret: dev-hu-registry-username
+      password: 
+        from_secret: dev-hu-registry-password
+      platforms:
+        - linux/amd64
+        - linux/arm64
+    
+  - name: pull image to dockerhub
+    image: docker.io/owncloudci/drone-docker-buildx:4
+    privileged: true
+    settings:
+      cache-from: [ "safebox/jellyfin-init-container" ]
+      repo: safebox/jellyfin-init-container
+      tags: latest
+      username:
+        from_secret: dockerhub-username
+      password: 
+        from_secret: dockerhub-password
+      platforms:
+        - linux/amd64
+        - linux/arm64

Dockerfile

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+FROM alpine:latest
+
+RUN apk --update --no-cache add yq
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod a+x /entrypoint.sh
+
+CMD /entrypoint.sh

entrypoint.sh

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+#!/bin/sh
+
+SELECTOR=${JELLYFIN:-jellyfin}
+JELLYFIN_IP=$(hostname -i | awk '{print $1}')
+HOST_FILE=/etc/system/data/dns/hosts.local
+
+EXISTS=$(grep -w -F $SELECTOR $HOST_FILE)
+if [ -n "$EXISTS" ]; then
+    # selector already exists in hosts file and SCALE is not in use
+    IP=$(echo $EXISTS | cut -d ' ' -f1)
+    sed "s/$IP/$JELLYFIN_IP/g" $HOST_FILE >/tmp/hosts.local
+    mv /tmp/hosts.local $HOST_FILE
+else
+    echo "$JELLYFIN_IP $SELECTOR" >>$HOST_FILE
+fi
+
+# create neccesary directories
+mkdir -p /etc/user/data/jellyfin/config
+mkdir -p /etc/system/data/jellyfin/cache
+mkdir -p /etc/user/data/jellyfin/media