add basic ansible role for debian deployment

Currently only Debian 10 buster is supported.
Other Debian versions, Ubuntu and derivates should be easy to integrate.
Database deployment is considered out-of-scope and deferred to the user.
Provides basic upgrade support between releases.

ansible/defaults/main.yml

@@ -0,0 +1,39 @@
+---
+paperlessng_version: 0.9.8
+paperlessng_directory: /opt/paperless-ng
+paperlessng_consumption_dir: "{{ paperlessng_directory }}/consumption"
+paperlessng_data_dir: "{{ paperlessng_directory }}/data"
+paperlessng_media_root: "{{ paperlessng_directory }}/media"
+paperlessng_static_dir: "{{ paperlessng_directory }}/static"
+paperlessng_filename_format:
+paperlessng_virtualenv: "{{ paperlessng_directory }}/.venv"
+
+paperlessng_ocr_languages:
+  - eng
+paperlessng_time_zone: Europe/Berlin
+paperlessng_ocrmypdf_args: --optimize 1
+# TODO Does optimze==1 really work with jbig2enc?
+# https://ocrmypdf.readthedocs.io/en/latest/jbig2.html#lossy-mode-jbig2
+# Documentation states -O1 only applies lossless transformations
+# https://ocrmypdf.readthedocs.io/en/latest/optimizer.html#lossless-optimizations
+paperlessng_use_jbig2enc: true
+
+paperlessng_superuser_name: paperlessng
+paperlessng_superuser_email: paperlessng@example.com
+paperlessng_superuser_password: paperlessng
+
+paperlessng_system_user: paperlessng
+paperlessng_system_group: paperlessng
+
+paperlessng_listen_address: 127.0.0.1
+paperlessng_listen_port: 8000
+
+paperlessng_redis_host: localhost
+paperlessng_redis_port: 6379
+
+paperlessng_db_type: sqlite # or postgresql
+paperlessng_db_host: localhost
+paperlessng_db_port: 5432
+paperlessng_db_name: paperlessng
+paperlessng_db_user: paperlessng
+paperlessng_db_pass: paperlessng