Fix string expressions

.gitlab-ci.yml

@@ -24,8 +24,8 @@ build-zynthbox-image-armhf:
     - git clone https://github.com/zynthbox/ZynthianOS.git
 
     # Setup Zynthbox Repo sourceline
-    - echo 'ZYNTHIANOS_ZYNTHBOX_REPO_KEY_URL=\'http://repo.zynthbox.io/testing/repo_key.pub\'' >> ZynthianOS/src/modules/zynthianos/config
-    - echo 'ZYNTHIANOS_ZYNTHBOX_REPO_SOURCELINE=\'deb http://repo.zynthbox.io/testing zynthbox main\'' >> ZynthianOS/src/modules/zynthianos/config
+    - echo "ZYNTHIANOS_ZYNTHBOX_REPO_KEY_URL='http://repo.zynthbox.io/testing/repo_key.pub'" >> ZynthianOS/src/modules/zynthianos/config
+    - echo "ZYNTHIANOS_ZYNTHBOX_REPO_SOURCELINE='deb http://repo.zynthbox.io/testing zynthbox main'" >> ZynthianOS/src/modules/zynthianos/config
 
     # Download prebuilt realtime kernel
     - wget "http://unofficialpi.org/Distros/RealtimePi/2021-06-15_2021-05-07-realtimepi-buster-armhf-lite-0.5.0.zip" -P ./ZynthianOS/src/image