diff --git a/.gitea/workflows/docker-publish.yml b/.gitea/workflows/docker-publish.yml
index 953b876..f5518e7 100644
--- a/.gitea/workflows/docker-publish.yml
+++ b/.gitea/workflows/docker-publish.yml
@@ -53,12 +53,10 @@ jobs:
           SAFE_REF="$(echo "${BRANCH_OR_TAG}" | tr '/' '-')"
           SHORT_SHA="$(echo "${SHA}" | cut -c1-12)"
 
-          TAGS=$(cat <<EOF
-${IMAGE}:latest
-${IMAGE}:${SAFE_REF}
-${IMAGE}:sha-${SHORT_SHA}
-EOF
-)
+          TAGS="$(printf '%s\n%s\n%s\n' \
+            "${IMAGE}:latest" \
+            "${IMAGE}:${SAFE_REF}" \
+            "${IMAGE}:sha-${SHORT_SHA}")"
 
           echo "tags<<EOF" >> "${GITHUB_OUTPUT}"
           echo "${TAGS}" >> "${GITHUB_OUTPUT}"