Add reusable workflows for Tag, Backport and Comment Commands

.github/workflows/provider-backport.yml

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+name: Backport
+
+on:
+  workflow_call:
+
+jobs:
+  # NOTE(negz): I tested many backport GitHub actions before landing on this
+  # one. Many do not support merge commits, or do not support pull requests with
+  # more than one commit. This one does. It also handily links backport PRs with
+  # new PRs, and provides commentary and instructions when it can't backport.
+  # The main gotchas with this action are that it _only_ supports merge commits,
+  # and that PRs _must_ be labelled before they're merged to trigger a backport.
+  open-pr:
+    runs-on: ubuntu-22.04
+    if: github.event.pull_request.merged
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Open Backport PR
+        uses: zeebe-io/[email protected]
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          github_workspace: ${{ github.workspace }}
+          version: v0.0.8

.github/workflows/provider-commands.yml

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+name: Comment Commands
+
+on:
+  workflow_call:
+
+jobs:
+  backport:
+    runs-on: ubuntu-22.04
+    if: github.event.issue.pull_request && startsWith(github.event.comment.body, '/backport')
+    steps:
+    - name: Extract Command
+      id: command
+      uses: xt0rted/slash-command-action@v1
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        command: backport
+        reaction: "true"
+        reaction-type: "eyes"
+        allow-edits: "false"
+        permission-level: write
+
+    - name: Checkout
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Open Backport PR
+      uses: zeebe-io/[email protected]
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        github_workspace: ${{ github.workspace }}
+        version: v0.0.4

.github/workflows/provider-tag.yml

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+name: Tag
+
+on:
+  workflow_call:
+    inputs:
+      version:
+        description: 'Release version (e.g. v0.1.0)'
+        required: true
+        type: string
+      message:
+        description: 'Tag message'
+        required: true
+        type: string
+
+jobs:
+  create-tag:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Create Tag
+        uses: negz/create-tag@v1
+        with:
+          version: ${{ inputs.version }}
+          message: ${{ inputs.message }}
+          token: ${{ secrets.GITHUB_TOKEN }}