Use sticky comments for README Diff

After filing LouisBrunner/diff-action#21 this was addressed in LouisBrunner/diff-action#22 and released in https://github.com/LouisBrunner/diff-action/releases/tag/v2.1.0

.github/workflows/helm-charts-test.yaml

@@ -54,7 +54,7 @@ jobs:
         run: |
           make generate
       - name: Check that the files are the exact same
-        uses: LouisBrunner/diff-action@v2.0.0
+        uses: LouisBrunner/diff-action@v2.1.0
         with:
           old: charts/${{ matrix.chart }}/README.current.md
           new: charts/${{ matrix.chart }}/README.md
@@ -63,6 +63,8 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
           notify_check: true
           notify_issue: true
+          sticky_comment: true
+          title: ${{ matrix.chart }}
   validate-values-schema:
     runs-on: ubuntu-latest
     name: Validate values schema json

README.md

@@ -20,4 +20,4 @@ Opinionated helm chats for my personal projects, and OSS Projects that either do
 ## Opinionated decisions shared by all charts
 
 * All have pod anti-affinity to be not be on the same node
-* All deployments have a pod disruption budget that only allows one unavailble pod when there are more then one replicas
+* All deployments have a pod disruption budget that only allows one unavailable pod when there are more then one replicas