clearfog: enable `rauc install` via https://

Since the CI puts builds into a server that actively redirects to its
HTTPS counterpart, make sure we handle (trusted) HTTPS servers
correctly.

Change-Id: I9455d3f83160e5f0557edc63a24ae43fed799136
diff --git a/configs/czechlight_clearfog_defconfig b/configs/czechlight_clearfog_defconfig
index 8126a8b..e275dfd 100644
--- a/configs/czechlight_clearfog_defconfig
+++ b/configs/czechlight_clearfog_defconfig
@@ -44,6 +44,7 @@
 BR2_PACKAGE_PMBUS_PEEK=y
 BR2_PACKAGE_SPI_TOOLS=y
 BR2_PACKAGE_UBOOT_TOOLS=y
+BR2_PACKAGE_CA_CERTIFICATES=y
 BR2_PACKAGE_LIBSSH=y
 BR2_PACKAGE_LIBSSH_SERVER=y
 BR2_PACKAGE_LIBGPIOD_TOOLS=y