ci: Discord notification workflow for releases

When a new release is published, a Github Action workflow kicks off that
sends a customized notification to Discord.

.github/workflows/notify.yml

@@ -0,0 +1,21 @@
+name: Release Notification
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  notify:
+    name: Discord Notification
+    runs-on: ubuntu-latest
+    steps:
+      - run: wget https://raw.githubusercontent.com/rcdailey/trash-updater/master/ci/notify/discord_notify.py
+      - uses: actions/setup-python@v2
+        with:
+          python-version: '3.x'
+      - run: pip install discord-webhook
+      - run: |
+          python discord_notify.py \
+            "${{ github.event.release.tag_name }}" \
+            "${{ secrets.DISCORD_WEBHOOK }}" \
+            "${{ github.event.release.body }}"

ci/notify/discord_notify.py

@@ -0,0 +1,48 @@
+from discord_webhook import DiscordWebhook, DiscordEmbed
+import sys
+
+version = sys.argv[1]
+if not version:
+    print('Pass version as first argument')
+    exit(1)
+
+webhook_url = sys.argv[2]
+if not webhook_url:
+    print('Pass webhook URL as second argument')
+    exit(1)
+
+changelog = sys.argv[3]
+if not changelog:
+    print('Pass changelog as third argument')
+    exit(1)
+
+mkdown_desc = f'''
+**Release Notes**
+```
+{changelog}
+```
+'''
+
+embed = DiscordEmbed(
+    title=f'New Release {version}',
+    description=mkdown_desc,
+    url=f'https://github.com/rcdailey/trash-updater/releases/tag/{version}'
+    )
+
+embed.set_author(
+    name='Trash Updater',
+    url='https://github.com/rcdailey/trash-updater',
+    icon_url='https://github.com/rcdailey/trash-updater/blob/master/ci/notify/trash-icon.png?raw=true')
+
+embed.add_embed_field(name='Linux (x64)',
+    value=f'[Download](https://github.com/rcdailey/trash-updater/releases/download/{version}/trash-linux-x64.zip)')
+
+embed.add_embed_field(name='Windows (x64)',
+    value=f'[Download](https://github.com/rcdailey/trash-updater/releases/download/{version}/trash-win-x64.zip)')
+
+embed.add_embed_field(name='MacOS (x64)',
+    value=f'[Download](https://github.com/rcdailey/trash-updater/releases/download/{version}/trash-osx-x64.zip)')
+
+webhook = DiscordWebhook(webhook_url)
+webhook.add_embed(embed)
+print(webhook.execute())