Add functionality to auto assign team to issues

Author: JamyGolden

.github/CODEOWNERS

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+* @tinted-theming/tinty

.github/workflows/auto-assign-issues.yml

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+name: Issue assignment
+
+on:
+    issues:
+        types: [opened]
+
+jobs:
+    auto-assign:
+        runs-on: ubuntu-latest
+        permissions:
+            issues: write
+        steps:
+            - name: 'Auto-assign issue'
+              uses: pozil/auto-assign-issue@v1
+              with:
+                  repo-token: ${{ secrets.AUTO_ASSIGN_ISSUES }}
+                  teams: tinty
+                  allowSelfAssign: false