use OpenWISP shared secret from CI/CD variables

.gitlab-ci.yml

@@ -10,6 +10,7 @@ variables:
   REMOVE_PACKAGES: dnsmasq odhcpd-ipv6only wpad-basic-mbedtls
   DISABLED_SERVICES: firewall
   EXTRA_IMAGE_NAME: fakedOrg
+  #OPENWISP_SHARED_SECRET: <from-ci-variables>
 
 .build_image:
   stage: build
@@ -21,6 +22,7 @@ variables:
     - cd /builder
   script:
     - export REMOVE_PACKAGES=$(for package in ${REMOVE_PACKAGES}; do echo -n "-${package} "; done)
+    - sed -i "s/%OPENWISP_SHARED_SECRET%/${OPENWISP_SHARED_SECRET}/" ${FILES}/etc/config/openwisp
     - make image PROFILE=${PROFILE} FILES=${FILES} PACKAGES="${DEFAULT_PACKAGES} ${EXTRA_PACKAGES} ${REMOVE_PACKAGES}"
   after_script:
     - if [[ -d /builder/bin ]]; then mv /builder/bin .; fi

files/etc/config/openwisp

 config controller 'http'
         option url 'https://openwisp.faked.org'
-        option shared_secret 'fSIRdSdsqoKYhCYovE1zareJhkOKMtcL'
+        option shared_secret '%OPENWISP_SHARED_SECRET%'
         option default_hostname 'openwrt'
         option mac_interface 'br-lan'
         option management_interface 'br-lan'
-        option verify_ssl '0'