cmake: Add missing example CMakeLists.txt files, CI check all examples have both

examples/protocols/https_mbedtls/CMakeLists.txt

@@ -0,0 +1,14 @@
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+set(MAIN_SRCS main/https_mbedtls_example_main.c)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(https-mbedtls)
+
+# Embed the server root certificate into the final binary
+#
+# (If this was a component, we would set COMPONENT_EMBED_TXTFILES here.)
+target_add_binary_data(https-mbedtls.elf
+    "main/server_root_cert.pem" TEXT)