fix heroku one click deployment (#1255)

fix heroku one click deployment

app.json

@@ -19,10 +19,6 @@
             "description": "Let npm also install development build tool",
             "value": "false"
         },
-        "DB_TYPE": {
-            "description": "Specify database type. See sequelize available databases. Default using postgres",
-            "value": "postgres"
-        },
         "HMD_SESSION_SECRET": {
             "description": "Secret used to secure session cookies.",
             "required": false

bin/heroku

@@ -11,8 +11,7 @@ module.exports = {
     'config':          path.resolve('config.json'),
     'migrations-path': path.resolve('lib', 'migrations'),
     'models-path':     path.resolve('lib', 'models'),
-    'url':             process.env.DATABASE_URL,
+    'url':             process.env.DATABASE_URL
-    'dialect':         process.env.DB_TYPE
 }
 
 EOF
@@ -26,6 +25,4 @@ EOF
 
 EOF
 
-  # build app
-  npm run build
 fi

package.json

@@ -26,7 +26,8 @@
     "coverage": "nyc mocha --require intelli-espower-loader --exit --recursive ./test",
     "coverage:ci": "nyc mocha --no-color -R dot --require intelli-espower-loader --exit --recursive ./test",
     "test": "npm run-script lint && npm run-script jsonlint && npm run-script coverage",
-    "test:ci": "npm run-script lint && npm run-script jsonlint && npm run-script coverage:ci"
+    "test:ci": "npm run-script lint && npm run-script jsonlint && npm run-script coverage:ci",
+    "postinstall": "bin/heroku"
   },
   "dependencies": {
     "@hackmd/codemirror": "~5.46.2",
@@ -193,7 +194,7 @@
     "utf-8-validate": "~5.0.1"
   },
   "engines": {
-    "node": ">=8.0.0"
+    "node": ">=8.0.0 <12.0.0"
   },
   "maintainers": [
     {