Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -35,6 +35,7 @@ build:armhflinux:
     - touch .cargo/config.toml
     - echo "[target.arm-unknown-linux-gnueabihf]" >> .cargo/config.toml
     - echo "linker = \"$(pwd)/raspberrypi-tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-gcc\"" >> .cargo/config.toml
+    - apt-get update && apt-get install -y openssl:armhf
   script:
     - cargo build --release --target=arm-unknown-linux-gnueabihf
   artifacts: