Merge pull request #1334 from vector-im/fheese/workflow_create_latest_ci_unixtime

Addressing Deprecating save-state and set-output commands

.github/workflows/publish.yaml

@@ -18,9 +18,9 @@ jobs:
       contents: write # required to upload release asset
       packages: write
     steps:
-      - name: Get current date
-        id: current_date
-        run: echo "::set-output name=unix_time::$(date +'%s')"
+      - name: Get current time
+        id: current-time
+        run: echo "unix_time=$(date +'%s')" >> $GITHUB_OUTPUT
 
       - name: Check it out
         uses: actions/checkout@v2
@@ -69,7 +69,7 @@ jobs:
             type=sha,format=short,event=branch
             type=semver,pattern={{version}}
             type=raw,value=latest-ci,enable={{is_default_branch}}
-            type=raw,value=latest-ci_{{ steps.current_date.outputs.unix_time }},enable={{is_default_branch}}
+            type=raw,value=latest-ci_{{steps.current-time.outputs.unix_time}},enable={{is_default_branch}}
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@dc7b9719a96d48369863986a06765841d7ea23f6