change: replace deprecated set-output command with environment file in Github Actions (#1226)

.github/workflows/docs.yml

@@ -38,7 +38,7 @@ jobs:
         run: |
           git config --global user.name ghaction-k3d.io
           git config --global user.email ghaction@k3d.io
-          echo ::set-output name=tag::${GITHUB_REF#refs/tags/}
+          echo tag=${GITHUB_REF#refs/tags/} >> $GITHUB_OUTPUT
       - name: Build & Deploy with Mike (versioned)
         if: startsWith(github.ref, 'refs/tags/')
         run: |

.github/workflows/release.yaml

@@ -214,7 +214,7 @@ jobs:
       - name: Extract Tag from Ref
         if: startsWith(github.ref, 'refs/tags/')
         id: tag
-        run: echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//}
+        run: echo VERSION=${GITHUB_REF/refs\/tags\//} >> $GITHUB_OUTPUT
         shell: bash
       - uses: apexskier/github-semver-parse@v1
         if: startsWith(github.ref, 'refs/tags/')