Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -29,7 +29,7 @@ build:armhflinux:
     paths:
       - target/
   before_script:
-    - dpkg --add-architecture armhf && apt-get update && apt-get install -y openssl:armhf
+    - dpkg --add-architecture armhf && apt-get update && apt-get install -y openssl:armhf libssl-dev:armhf
     - rustup target add arm-unknown-linux-gnueabihf
     - git clone --depth=1 https://github.com/raspberrypi/tools raspberrypi-tools
     - mkdir .cargo && touch .cargo/config.toml