Simplify molecule tests

"Upgrade" path includes multiple paths anyway:
- installing the latest official release package
- builing the current PR from source
- upgrading between the two versions

ansible/molecule/default/converge.yml

@@ -0,0 +1,10 @@
+---
+- name: update previous release to newest release
+  hosts: all
+  tasks:
+    - name: set github ref as version when available
+      set_fact:
+        paperlessng_version: "{{ lookup('env', 'GITHUB_REF') | default('latest', True) }}"
+    - name: update to newest paperless-ng release
+      include_role:
+        name: ansible

ansible/molecule/default/molecule.yml

@@ -0,0 +1,35 @@
+---
+dependency:
+  name: galaxy
+driver:
+  name: docker
+platforms:
+  - name: ubuntu_focal
+    image: jrei/systemd-ubuntu:20.04
+    privileged: true
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    tmpfs:
+      - /tmp
+      - /run
+      - /run/lock
+    override_command: False
+  # ubuntu 18.04 bionic works except that
+  #   the default redis configuration expects IPv6 which is not enabled in docker by default
+  #   the default Python environment is configured for ASCII instead of UTF-8
+  # ubuntu 16.04 xenial only has Python 3.5 which is EOL and breaks multiple dependencies
+  - name: debian_buster
+    image: jrei/systemd-debian:10
+    privileged: true
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    tmpfs:
+      - /tmp
+      - /run
+      - /run/lock
+    override_command: False
+  # debian 9 stretch only has Python 3.5 which is EOL and breaks multiple dependencies
+provisioner:
+  name: ansible
+verifier:
+  name: ansible

ansible/molecule/default/prepare.yml

@@ -0,0 +1,10 @@
+- name: install previous release
+  hosts: all
+  tasks:
+    - name: set previous version as installation target
+      set_fact:
+        paperlessng_version: latest
+
+    - name: install previous paperless-ng release
+      include_role:
+        name: ansible

ansible/molecule/default/verify.yml

@@ -0,0 +1,91 @@
+---
+- name: Verify
+  hosts: all
+  gather_facts: false
+
+  vars_files:
+    - ../../defaults/main.yml
+
+  tasks:
+    - name: check if webserver is up
+      uri:
+        url: "http://{{ paperlessng_listen_address }}:{{ paperlessng_listen_port }}"
+        status_code: [200, 302]
+        return_content: yes
+      register: landingpage
+      failed_when: "'Sign in</button>' not in landingpage.content"
+
+    - name: generate random name and content
+      set_fact:
+        content: "{{ lookup('password', '/dev/null length=64 chars=ascii_letters') }}"
+        filename: "{{ lookup('password', '/dev/null length=8 chars=ascii_letters') }}"
+
+    - name: check if document posting works
+      uri:
+        url: "http://{{ paperlessng_listen_address }}:{{ paperlessng_listen_port }}/api/documents/post_document/"
+        method: POST
+        body_format: form-multipart
+        body:
+          document:
+            content: "{{ content }}"
+            filename: "{{ filename }}.txt"
+            mime_type: text/plain
+        headers:
+          Authorization: 'Basic {{ (paperlessng_superuser_name + ":" + paperlessng_superuser_password) | b64encode }}'
+        return_content: yes
+      register: post_document
+      failed_when: "'OK' not in post_document.content"
+
+    - name: verify uploaded document has been accepted
+      uri:
+        url: "http://{{ paperlessng_listen_address }}:{{ paperlessng_listen_port }}/api/logs/"
+        headers:
+          Authorization: 'Basic {{ (paperlessng_superuser_name + ":" + paperlessng_superuser_password) | b64encode }}'
+        return_content: yes
+      register: logs
+      failed_when: "('Consuming ' + filename + '.txt') not in logs.content"
+
+    # assumes txt consumption finished by now, might have to sleep a bit
+    - name: verify uploaded document has been consumed
+      uri:
+        url: "http://{{ paperlessng_listen_address }}:{{ paperlessng_listen_port }}/api/logs/"
+        headers:
+          Authorization: 'Basic {{ (paperlessng_superuser_name + ":" + paperlessng_superuser_password) | b64encode }}'
+        return_content: yes
+      register: logs
+      failed_when: "filename + ' consumption finished' not in logs.content"
+
+    - name: get documents
+      uri:
+        url: "http://{{ paperlessng_listen_address }}:{{ paperlessng_listen_port }}/api/documents/"
+        headers:
+          Authorization: 'Basic {{ (paperlessng_superuser_name + ":" + paperlessng_superuser_password) | b64encode }}'
+        return_content: yes
+      register: documents
+
+    - name: set document index
+      set_fact:
+        index: "{{ documents.json['results'][0]['id'] }}"
+
+    - name: verify uploaded document is avaiable
+      uri:
+        url: "http://{{ paperlessng_listen_address }}:{{ paperlessng_listen_port }}/api/documents/{{ index }}/"
+        headers:
+          Authorization: 'Basic {{ (paperlessng_superuser_name + ":" + paperlessng_superuser_password) | b64encode }}'
+        return_content: yes
+      register: document
+      failed_when: "'Not found.' in document.content or content not in document.json['content']"
+
+    - name: check if deleting uploaded document works
+      uri:
+        url: "http://{{ paperlessng_listen_address }}:{{ paperlessng_listen_port }}/api/documents/bulk_edit/"
+        method: POST
+        body_format: json
+        body:
+          documents: ["{{ index }}"]
+          method: delete
+          parameters: {}
+        headers:
+          Authorization: 'Basic {{ (paperlessng_superuser_name + ":" + paperlessng_superuser_password) | b64encode }}'
+      register: delete_document
+      failed_when: "'OK' not in delete_document.json['result']"