Add workflow to update API docs for releases.

.github/workflows/publish-versioned-api-ref.yml

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+name: "Publish Versioned API Reference Wiki page"
+
+on:
+  push:
+    tags:
+      - 'v[0-9]+.[0-9]+.[0-9]+'
+
+jobs:
+  publish-versioned-api-reference:
+    name: Publish Versioned API Reference Wiki
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout operator codebase
+        uses: actions/checkout@v2
+        with:
+          path: messaging-topology-operator
+      - name: Get the version
+        id: get_version
+        run: echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//}
+      - name: Checkout wiki codebase
+        uses: actions/checkout@v2
+        with:
+          repository: ${{ github.repository }}.wiki
+          path: wiki
+      - name: Push to wiki
+        run: |
+          cd wiki
+          git config --local user.email "[email protected]"
+          git config --local user.name "github-actions"
+          # Add the versioned API Reference to the Wiki
+          cp ../messaging-topology-operator/docs/api/rabbitmq.com.ref.asciidoc ./API_Reference_${{ steps.get_version.outputs.VERSION }}.asciidoc
+          # Regenerate the ordered list of API Reference docs for the sidebar
+          export REGENERATED_SIDEBAR="$(../messaging-topology-operator/hack/generate-ordered-api-reference-list.sh .)"
+          echo "$REGENERATED_SIDEBAR" > Wiki_Sidebar.md
+          git add ./API_Reference_${{ steps.get_version.outputs.VERSION }}.asciidoc
+          git add ./Wiki_Sidebar.md
+          git commit -m "Publish version ${{ steps.get_version.outputs.VERSION }} API Reference" && git push
+      - uses: 8398a7/action-slack@v3
+        with:
+          status: ${{ job.status }}
+          fields: repo,message,action,eventName
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+        if: failure()

hack/generate-ordered-api-reference-list.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+wikiDir=$1
+
+generateVersionedEntry() {
+  echo "* [$1](https://github.com/rabbitmq/messaging-topology-operator/wiki/API_Reference_$1)"
+}
+
+generateLatestEntry() {
+  echo "* [Latest](https://github.com/rabbitmq/messaging-topology-operator/wiki/API_Reference)"
+}
+
+lead='^<!--- BEGIN API REFERENCE LIST -->$'
+tail='^<!--- END API REFERENCE LIST -->$'
+
+unorderedlistfile="$(mktemp)"
+orderedlistfile="$(mktemp)"
+
+apiVersions="$(find "$wikiDir/API_Reference_*" -printf "%f\n" | sed -r 's/API_Reference_(v[0-9]+.[0-9]+.[0-9]+).asciidoc/\1/' | sort -Vr )"
+for version in $apiVersions
+do
+  generateVersionedEntry "$version" >> "$unorderedlistfile"
+done
+
+# Latest API version is a special case, that is always top of the list
+generateLatestEntry > "$orderedlistfile"
+cat "$unorderedlistfile" >> "$orderedlistfile"
+
+sed -e "/$lead/,/$tail/{ /$lead/{p; r $orderedlistfile
+}; /$tail/p; d }"  "$wikiDir/Wiki_Sidebar.md"