ci: add pycafe sandbox link

.github/pycafe-create-status.py

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+import os
+import sys
+from urllib.parse import quote
+
+from github import Github
+
+# Authenticate with GitHub
+access_token = os.getenv("GITHUB_TOKEN")
+g = Github(access_token)
+
+
+repo_name = "widgetti/solara"
+pr_number = int(sys.argv[1])  # e.g 65
+type = "solara"  # streamlit/dash/vizro/solara/panel
+
+# your default code
+code = """import ipyreact
+
+
+class ConfettiWidget(ipyreact.ValueWidget):
+    _esm = \"""
+    import confetti from "canvas-confetti";
+    import * as React from "react";
+
+    export default function({value, setValue}) {
+        return <button onClick={() => confetti() && setValue(value + 1)}>
+            {value || 0} times confetti
+        </button>
+    };\"""
+page = ConfettiWidget()
+"""
+
+# your default requirements
+requirements = """solara
+ipyreact
+"""
+
+# GitHub Python API
+repo = g.get_repo(repo_name)
+pr = repo.get_pull(pr_number)
+
+base_url = f"https://py.cafe/snippet/{type}/v1"
+url = f"{base_url}#code={quote(code)}&requirements={quote(requirements)}"
+
+commit_sha = pr.head.sha
+
+# Define the deployment status
+state = "success"  # Options: 'error', 'failure', 'pending', 'success'
+description = "Test out this PR on a PyCafe environment"
+context = "PyCafe"
+
+# Create the status on the commit
+commit = repo.get_commit(commit_sha)
+commit.create_status(state="success", target_url=url, description="Test this PR in PyCafe environment", context="PyCafe")
+print(f"Deployment status added to commit {commit_sha}, PR https://github.com/{repo_name}/pull/{pr_number}")

.github/workflows/pycafe.yml

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+---
+name: PyCafe Sandbox Link
+on:
+  pull_request_target:
+    types:
+      - opened
+      - synchronize
+jobs:
+  runs-on: ubuntu-latest
+  steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Create PyCafe status link
+      run: python .github/pycafe-create-status.py ${{ github.event.number }}
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}