Added miniflux config

miniflux/db.env.example

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+POSTGRES_DB=miniflux
+POSTGRES_USER=miniflux
+POSTGRES_PASSWORD=changeme

miniflux/docker-compose.yml

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+version: '3.5'
+
+services:
+    app:
+        image: 'miniflux/miniflux:latest'
+        restart: 'always'
+
+        depends_on:
+            - 'db'
+        env_file:
+            - 'miniflux.env'
+        labels:
+            - 'com.centurylinklabs.watchtower.enable=true'
+        networks:
+            - 'default'
+            - 'nginx'
+    
+    db:
+        image: 'postgres:13-alpine'
+        restart: 'always'
+
+        env_file:
+            - 'db.env'
+        labels:
+            - 'com.centurylinklabs.watchtower.enable=true'
+        volumes:
+            - 'db-data:/var/lib/postgresql/data'
+
+networks:
+    nginx:
+        external: true
+
+volumes:
+    db-data:

miniflux/miniflux.env.example

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+# Database settings
+DATABASE_URL=postgres://miniflux:changeme@db/miniflux?sslmode=disable
+RUN_MIGRATIONS=1
+
+# Auto-create admin user
+CREATE_ADMIN=1
+ADMIN_USERNAME=admin
+ADMIN_PASSWORD=changeme