Try n3

.forgejo/workflows/auto-update.yaml

@@ -40,11 +40,7 @@ jobs:
         if: steps.changes.outputs.changed == 'true'
         run: |
           HOSTS=$(nix eval --json .#colmena --apply 'x: builtins.filter (n: n != "meta" && builtins.elem "lxc" (x.${n}.deployment.tags or [])) (builtins.attrNames x)')
-          {
-            echo 'hosts<<EOF'
-            echo "$HOSTS"
-            echo 'EOF'
-          } >> $FORGEJO_OUTPUT
+          echo "hosts=$HOSTS" >> $FORGEJO_OUTPUT
           echo "Discovered hosts: $HOSTS"
 
       - name: Upload flake.lock
@@ -62,11 +58,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        host: ${{ fromJson(needs.check-updates.outputs.hosts) }}
+        host: ${{ needs.check-updates.outputs.hosts }}
     steps:
       - name: Debug HOSTS
         run: |
-          echo 'HOSTS: ${{ needs.check-updates.outputs.hosts }}'
+          echo "HOSTS: "${{ needs.check-updates.outputs.hosts }}
 
       - name: Checkout repository
         uses: actions/checkout@v4