chore: add action to check for repro

.github/workflows/check-repro.yml

@@ -0,0 +1,42 @@
+name: Check for repro
+on:
+  issues:
+    types: [opened, edited]
+  issue_comment:
+    types: [created, edited]
+
+jobs:
+  check-repro:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@v2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const body = context.payload.comment
+              ? context.payload.comment.body
+              : context.payload.issue.body
+
+            if (!/https?:\/\/((github\.com\/[^/]+\/[^/]+)|(snack\.expo\.io\/.+))/gm.test(body)) {
+              return
+            }
+
+            await github.issues.addLabels({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              labels: ['repro provided'],
+            })
+
+            try {
+              await github.issues.removeLabel({
+                issue_number: context.issue.number,
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                name: 'needs repro',
+              })
+            } catch (error) {
+              if (!/Label does not exist/.test(e.message)) {
+                throw error
+              }
+            }