Try release hooks

Dockerfile

@@ -3,6 +3,6 @@ FROM gitea/gitea:1.11.2
 COPY . ${WORKDIR}
 
 RUN mkdir -p /app/
-COPY postdeploy.sh /app/
+COPY release.sh /app/
 
 EXPOSE 3000

Procfile

@@ -0,0 +1 @@
+release: bash /app/release.sh

app.json

@@ -1,6 +1,5 @@
 {
   "name": "gitea",
   "description": "Gitea is a painless self-hosted Git service.",
-  "repository": "https://gitlab.com/autonomic-cooperative/gitea-dokku",
-  "scripts": { "dokku": { "postdeploy": "bash /app/postdeploy.sh" } }
+  "repository": "https://gitlab.com/autonomic-cooperative/gitea-dokku"
 }