[CI] add woodpecker CI

.woodpecker/lint.yml

@@ -0,0 +1,6 @@
+steps:
+  mypy:
+    image: python:3
+    script:
+      - pip3 install mypy types-setuptools
+      - mypy slixmpp

.woodpecker/test-integration.yml

@@ -0,0 +1,9 @@
+steps:
+  test_integration:
+    image: "python:3.11"
+    secrets: [ci_account1, ci_account1_password, ci_account2, ci_account2_password]
+    commands:
+      - apt-get update
+      - apt-get install -y python3-pip cython3 gpg
+      - pip3 install emoji aiohttp aiodns
+      - ./run_integration_tests.py

.woodpecker/test.yml

@@ -0,0 +1,17 @@
+steps:
+  unit_tests:
+    image: "python:${TAG}"
+    commands:
+    - apt-get update
+    - apt-get install -y python3 python3-pip cython3 gpg
+    - pip3 install emoji aiohttp cryptography
+    - ./run_tests.py
+
+matrix:
+  TAG:
+    - "3.7"
+    - "3.9"
+    - "3.8"
+    - "3.10"
+    - "3.11"
+    - "3.12"