feat: setup canary releases using changesets

.changeset/README.md

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+# Changesets
+
+Hello and welcome! This folder has been automatically generated by `@changesets/cli`, a build tool that works
+with multi-package repos, or single-package repos to help you version and publish your code. You can
+find the full documentation for it [in our repository](https://github.com/changesets/changesets)
+
+We have a quick list of common questions to get you started engaging with this project in
+[our documentation](https://github.com/changesets/changesets/blob/main/docs/common-questions.md)

.changeset/config.json

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+{
+  "$schema": "https://unpkg.com/@changesets/[email protected]/schema.json",
+  "changelog": "@changesets/cli/changelog",
+  "commit": false,
+  "linked": [],
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

.github/workflows/canary.yml

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+name: Canary Release
+
+on:
+  pull_request:
+    branches:
+      - main
+
+env:
+  NODE_VERSION_USED_FOR_DEVELOPMENT: 17
+jobs:
+  publish-canary:
+    name: Publish Canary
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Main
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v2
+        with:
+          cache: npm
+          node-version: ${{ env.NODE_VERSION_USED_FOR_DEVELOPMENT }}
+
+      - name: Install Dependencies
+        run: npm ci --ignore-scripts
+
+      - name: Setup NPM credentials
+        run: echo "//registry.npmjs.org/:_authToken=$NODE_AUTH_TOKEN" >> ~/.npmrc
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NODE_AUTH_TOKEN }}
+
+      - name: Release Canary
+        id: canary
+        uses: 'kamilkisiela/release-canary@master'
+        with:
+          npm-token: ${{ secrets.NODE_AUTH_TOKEN }}
+          npm-script: 'npm run release:canary'
+          changesets: true
+
+      - name: Publish a message
+        if: steps.canary.outputs.released
+        uses: 'kamilkisiela/pr-comment@master'
+        with:
+          message: |
+            The latest changes of this PR are available as alpha in npm (based on the declared `changesets`):
+            ```
+            ${{ steps.canary.outputs.changesetsPublishedPackages}}
+            ```
+          bot-token: ${{ secrets.GH_API_TOKEN }}
+          bot: 'theguild-bot'
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Publish a empty message
+        if: steps.canary.outputs.released == 'false'
+        uses: 'kamilkisiela/pr-comment@master'
+        with:
+          message: |
+            The latest changes of this PR are not available as alpha, since there are no linked `changesets` for this PR.
+          bot-token: ${{ secrets.GH_API_TOKEN }}
+          bot: 'theguild-bot'
+          github-token: ${{ secrets.GITHUB_TOKEN }}