diff --git a/.gitea/workflows/build-and-deploy.yml b/.gitea/workflows/build-and-deploy.yml
index bff4cbc..fe2a479 100644
--- a/.gitea/workflows/build-and-deploy.yml
+++ b/.gitea/workflows/build-and-deploy.yml
@@ -29,27 +29,37 @@ jobs:
           DB_HOSTNAME: ${{ env.DB_HOSTNAME }}
         run: |
           set -euo pipefail
-          cp .example.env .env
+          if [ ! -f .env ]; then
+            cp .example.env .env
 
-          awk -v host="$DB_HOSTNAME" -v newpwd="$MYSQL_PASSWORD" '
-          BEGIN { has_host = 0; has_pwd = 0 }
-          $0 ~ /^HOSTNAME=/ {
-              print "HOSTNAME=" host
-              has_host = 1
-              next
-          }
-          $0 ~ /^PASSWORD=/ {
-              print "PASSWORD=" newpwd
-              has_pwd = 1
-              next
-          }
-          { print }
-          END {
-              if (!has_host) print "HOSTNAME=" host
-              if (!has_pwd) print "PASSWORD=" newpwd
-          }' .env > .env.tmp
+            awk -v host="$DB_HOSTNAME" -v newpwd="$MYSQL_PASSWORD" '
+            BEGIN { has_host = 0; has_pwd = 0; has_demo = 0 }
+            $0 ~ /^HOSTNAME=/ {
+                print "HOSTNAME=" host
+                has_host = 1
+                next
+            }
+            $0 ~ /^PASSWORD=/ {
+                print "PASSWORD=" newpwd
+                has_pwd = 1
+                next
+            }
+            $0 ~ /^IS_DEMO=/ {
+                print "IS_DEMO=true"
+                has_demo = 1
+                next
+            }
+            { print }
+            END {
+                if (!has_host) print "HOSTNAME=" host
+                if (!has_pwd) print "PASSWORD=" newpwd
+                if (!has_demo) print "IS_DEMO=true"
+            }' .env > .env.tmp
 
-          mv .env.tmp .env
+            mv .env.tmp .env
+          else
+            echo ".env exists in repository, skip generating/replacing."
+          fi
 
       - name: 打包发布文件
         shell: bash