diff --git a/.gitea/workflows/build.yaml b/.gitea/workflows/build.yaml
index 3ce079f..167e58c 100644
--- a/.gitea/workflows/build.yaml
+++ b/.gitea/workflows/build.yaml
@@ -23,6 +23,15 @@ jobs:
         run: |
           set -euo pipefail
 
+          set_output() {
+            local key="$1"
+            local value="$2"
+            if [ -n "${GITHUB_OUTPUT:-}" ]; then
+              echo "$key=$value" >> "$GITHUB_OUTPUT"
+            fi
+            echo "::set-output name=$key::$value"
+          }
+
           if git rev-parse --verify HEAD^ >/dev/null 2>&1; then
             CHANGED_FILES=$(git diff --name-only HEAD^ HEAD)
           else
@@ -36,8 +45,8 @@ jobs:
 
           # Build everything for workflow/docker/shared backend changes.
           if echo "$CHANGED_FILES" | grep -Eq '^(\.gitea/workflows/|Dockerfile|Dockerfile\.|Cargo\.toml|Cargo\.lock|crates/|scripts/)'; then
-            echo "services_csv=$ALL_SERVICES" >> "$GITHUB_OUTPUT"
-            echo "has_changes=true" >> "$GITHUB_OUTPUT"
+            set_output "services_csv" "$ALL_SERVICES"
+            set_output "has_changes" "true"
             exit 0
           fi
 
@@ -82,11 +91,11 @@ jobs:
           done <<< "$CHANGED_FILES"
 
           if [ -z "$SERVICES" ]; then
-            echo "services_csv=" >> "$GITHUB_OUTPUT"
-            echo "has_changes=false" >> "$GITHUB_OUTPUT"
+            set_output "services_csv" ""
+            set_output "has_changes" "false"
           else
-            echo "services_csv=$SERVICES" >> "$GITHUB_OUTPUT"
-            echo "has_changes=true" >> "$GITHUB_OUTPUT"
+            set_output "services_csv" "$SERVICES"
+            set_output "has_changes" "true"
           fi
 
   build: