diff --git a/admin/Dockerfile b/admin/Dockerfile
index d0db3910c..2678c7c29 100644
--- a/admin/Dockerfile
+++ b/admin/Dockerfile
@@ -67,11 +67,12 @@ COPY ./admin/ .
 # Copy everything from config
 COPY ./config/ ../config/
 
+# yarn install and build config
+RUN cd ../config && yarn install --production=false --frozen-lockfile --non-interactive && yarn build
+
 # yarn install admin
 RUN yarn install --production=false --frozen-lockfile --non-interactive
-# yarn install config
-RUN cd ../config && yarn install --production=false --frozen-lockfile --non-interactive
-RUN cd ../config && yarn build
+
 # yarn build
 RUN yarn run build
 
diff --git a/backend/Dockerfile b/backend/Dockerfile
index 8bf65e300..de85f5db6 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -70,24 +70,21 @@ COPY ./database/ ../database/
 # Copy everything from config
 COPY ./config/  ../config/
 
+# yarn install and build config
+RUN cd ../config && yarn install --production=false --frozen-lockfile --non-interactive && yarn build
+
 # yarn install backend
 RUN yarn install --production=false --frozen-lockfile --non-interactive
 
 # yarn install database
 RUN cd ../database && yarn install --production=false --frozen-lockfile --non-interactive
 
-# yarn install config
-RUN cd ../config && yarn install --production=false --frozen-lockfile --non-interactive
-
 # yarn build
 RUN yarn build
 
 # yarn build database
 RUN cd ../database && yarn build
 
-# yarn build config
-RUN cd ../config && yarn build
-
 ##################################################################################
 # TEST ###########################################################################
 ##################################################################################
diff --git a/config/.nvmrc b/config/.nvmrc
new file mode 100644
index 000000000..79bdb1b97
--- /dev/null
+++ b/config/.nvmrc
@@ -0,0 +1 @@
+v18.7.0
diff --git a/config/src/commonSchema.ts b/config/src/commonSchema.ts
index 4b48e82bc..46264217b 100644
--- a/config/src/commonSchema.ts
+++ b/config/src/commonSchema.ts
@@ -2,7 +2,7 @@ import Joi from 'joi'
 
 export const browserUrls = Joi.array()
   .items(Joi.string().uri()) 
-  .custom((value: Joi.string, helpers: Joi.helpers<Joi.string>) => {
+  .custom((value: string[], helpers: Joi.CustomHelpers<string[]>) => {
     const protocol = new URL(value[0]).protocol
     for (const url of value) {
       if (new URL(url).protocol !== protocol) {
@@ -28,7 +28,7 @@ export const DB_VERSION = Joi.string()
 
 export const COMMUNITY_URL = Joi.string()
   .uri({ scheme: ['http', 'https'] })
-  .custom((value: Joi.string, helpers: Joi.helpers<Joi.string>) => {
+  .custom((value: string, helpers: Joi.CustomHelpers<string>) => {
     if (value.endsWith('/')) {
       return helpers.error('any.invalid', { message: 'URL should not end with a slash (/)' })
     }
diff --git a/frontend/Dockerfile b/frontend/Dockerfile
index e2d3239e6..96d0106bb 100644
--- a/frontend/Dockerfile
+++ b/frontend/Dockerfile
@@ -68,12 +68,12 @@ COPY ./frontend ./
 # Copy everything from config
 COPY ./config/  ../config/
 
+# install and build config
+RUN cd ../config && yarn install --production=false --frozen-lockfile --non-interactive && yarn build
+
 # npm install
 RUN yarn global add node-gyp && yarn install --production=false --frozen-lockfile --non-interactive
 
-# install and build config
-RUN cd ../config && yarn install --production=false --frozen-lockfile --non-interactive
-RUN cd ../config && yarn build
 # npm build
 RUN yarn run build