ci: Use GITHUB_OUTPUT envvar instead of set-output command

.github/workflows/chart.yaml

@@ -34,13 +34,13 @@ jobs:
         id: new-version
         run: |
           NEW_VERSION=$(yq e '.version' charts/gitops-server/Chart.yaml)
-          echo "::set-output name=version::$NEW_VERSION"
+          echo "version=$NEW_VERSION" >> $GITHUB_OUTPUT
       - name: Find old version
         id: old-version
         run: |
           git checkout ${{ github.event.pull_request.base.sha || github.event.before }}
           OLD_VERSION=$(yq e '.version' charts/gitops-server/Chart.yaml)
-          echo "::set-output name=version::$OLD_VERSION"
+          echo "version=$OLD_VERSION" >> $GITHUB_OUTPUT
 
   helm-will-release:
     runs-on: ubuntu-latest
@@ -59,7 +59,7 @@ jobs:
           git log --exit-code $last_revision...${{ github.event.pull_request.base.sha }} charts/gitops-server
           unreleased_commits=$?
           if [[ $unreleased_commits == 1 ]]; then
-              echo "::set-output name=unreleased-commits::The last chart was last released in $last_revision and there have been other changes in the chart since"
+              echo "unreleased-commits=The last chart was last released in $last_revision and there have been other changes in the chart since" >> $GITHUB_OUTPUT
           fi
       - name: Let user know merging will cause a release
         uses: actions/github-script@d7906e4ad0b1822421a7e6a35d5ca353c962f410 # v6.4.1
@@ -86,7 +86,7 @@ jobs:
         id: new_version
         run: |
           NEW_VERSION=$(yq e '.version' charts/gitops-server/Chart.yaml)
-          echo "::set-output name=version::$NEW_VERSION"
+          echo "version=$NEW_VERSION" >> $GITHUB_OUTPUT
       - name: Generate new chart
         run: |
           URL=https://helm.gitops.weave.works

.github/workflows/pr.yaml

@@ -106,7 +106,7 @@ jobs:
       tag: ${{ steps.generate-tag.outputs.tag }}
     steps:
       - id: generate-tag
-        run: echo "::set-output name=tag::$(date -u +%s)-${{ github.sha }}"
+        run: echo "tag=$(date -u +%s)-${{ github.sha }}" >> $GITHUB_OUTPUT
 
   ci-build-gitops-image:
     name: CI Build Gitops Docker Image
@@ -197,7 +197,7 @@ jobs:
     - id: gitsha
       run: |
         gitsha=$(git rev-parse --short ${{ github.sha }})
-        echo "::set-output name=sha::$gitsha"
+        echo "sha=$gitsha" >> $GITHUB_OUTPUT
     - name: build
       run: |
         make gitops
@@ -241,7 +241,7 @@ jobs:
         id: package-version
         run: |
           GITOPS_VERSION=$(git describe)
-          echo "::set-output name=js-version::$GITOPS_VERSION"
+          echo "js-version=$GITOPS_VERSION" >> $GITHUB_OUTPUT
           jq '.version = "'$GITOPS_VERSION'" | .name = "@weaveworks/weave-gitops-main"' < dist/package.json > dist/package-new.json
           mv dist/package-new.json dist/package.json
           cp .npmrc dist

.github/workflows/release.yaml

@@ -31,7 +31,7 @@ jobs:
           GITHUB_EVENT_PULL_REQUEST_HEAD_REF: ${{ github.event.pull_request.head.ref }}
         run: |
           version=$(echo $GITHUB_EVENT_PULL_REQUEST_HEAD_REF | cut -d'/' -f2)
-          echo "::set-output name=version::$version"
+          echo "version=$version" >> $GITHUB_OUTPUT
       - name: Set tag
         run: |
           git config user.name weave-gitops-bot

.github/workflows/upgrade-flux.yaml

@@ -23,7 +23,7 @@ jobs:
           new_version="$(curl -s --request GET --url "https://api.github.com/repos/fluxcd/flux2/releases?per_page=1" | jq . | jq '.[0] | .tag_name' | jq -r | sed -e 's/v//')"
 
           if [[ "$old_version" != "$new_version" ]]; then
-              echo "::set-output name=version::$new_version"
+              echo "version=$new_version" >> $GITHUB_OUTPUT
           fi
   upgrade-flux:
     needs: