chore: update woodpecker deployment config to inject secrets via environment variables

.woodpecker.yml

@@ -19,10 +19,13 @@ steps:
 
   - name: deploy
     image: alpine:3.18
+    environment:
+      FTP_USERNAME:
+        from_secret: ftp_username
+      FTP_PASSWORD:
+        from_secret: ftp_password
+      FTP_HOST:
+        from_secret: ftp_host
     commands:
       - apk add --no-cache lftp
-      - echo "FTP_HOST length = ${#FTP_HOST}"
-      - echo "FTP_USERNAME length = ${#FTP_USERNAME}"
-      - echo "FTP_PASSWORD length = ${#FTP_PASSWORD}"
       - lftp -d -u "$FTP_USERNAME","$FTP_PASSWORD" -e "set ssl:verify-certificate no; set ftp:ssl-allow yes; set ftp:ssl-force true; set ftp:ssl-protect-data true; set ftp:passive-mode true; mirror -R dist/ ./; quit" $FTP_HOST
-    secrets: [ ftp_username, ftp_password, ftp_host ]