ci: add build for Juno with Mbed TLS

Build for the Juno platform with Mbed TLS as the core crypto library.
This would have caught the issue fixed in commit 021fee0 ("core:
mbedtls: Fix build").

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>

.github/workflows/ci.yml

@@ -151,6 +151,8 @@ jobs:
           if [ -d $HOME/scp-firmware ]; then _make PLATFORM=vexpress-fvp CFG_SCMI_SCPFW=y CFG_SCP_FIRMWARE=$HOME/scp-firmware; fi
           _make PLATFORM=vexpress-juno
           _make PLATFORM=vexpress-juno CFG_ARM64_core=y
+          _make PLATFORM=vexpress-juno CFG_CRYPTOLIB_NAME=mbedtls CFG_CRYPTOLIB_DIR=lib/libmbedtls
+          _make PLATFORM=vexpress-juno CFG_ARM64_core=y CFG_CRYPTOLIB_NAME=mbedtls CFG_CRYPTOLIB_DIR=lib/libmbedtls
           _make PLATFORM=hikey
           _make PLATFORM=hikey CFG_ARM64_core=y
           _make PLATFORM=mediatek-mt8173