Add Mako workflow (#98)

.github/reviewers.yml

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+default:
+  - TSRBerry

.github/workflows/mako.yml

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+name: Mako
+on:
+  discussion:
+    types: [created, edited, answered, unanswered, category_changed]
+  discussion_comment:
+    types: [created, edited]
+  gollum:
+  issue_comment:
+    types: [created, edited]
+  issues:
+    types: [opened, edited, reopened, pinned, milestoned, demilestoned, assigned, unassigned, labeled, unlabeled]
+  pull_request_target:
+    types: [opened, edited, reopened, synchronize, ready_for_review, assigned, unassigned]
+
+jobs:
+  tasks:
+    name: Run Ryujinx tasks
+    permissions:
+      actions: read
+      contents: read
+      discussions: write
+      issues: write
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        if: github.event_name == 'pull_request_target'
+        with:
+          # Ensure we pin the source origin as pull_request_target run under forks.
+          fetch-depth: 0
+          repository: Ryujinx/ryuko-ng
+          ref: master
+
+      - name: Run Mako command
+        uses: Ryujinx/Ryujinx-Mako@master
+        with:
+          command: exec-ryujinx-tasks
+          args: --event-name "${{ github.event_name }}" --event-path "${{ github.event_path }}" -w "${{ github.workspace }}" "${{ github.repository }}" "${{ github.run_id }}"
+          app_id: ${{ secrets.MAKO_APP_ID }}
+          private_key: ${{ secrets.MAKO_PRIVATE_KEY }}
+          installation_id: ${{ secrets.MAKO_INSTALLATION_ID }}