Fix setting the HTTPS proxy (#10739)

Some places were not correctly setting the HTTPS proxy, and were only
setting the HTTP proxy. This was fine until Docker 20.10.10, which then
started using `https_proxy` for HTTPS connections.

Signed-off-by: Saikrishna Arcot <[email protected]>

slave.mk

@@ -791,8 +791,9 @@ $(SONIC_INSTALL_WHEELS) : $(PYTHON_WHEELS_PATH)/%-install : .platform $$(addsuff
 
 # start docker daemon
 docker-start :
-	@sudo sed -i '/http_proxy/d' /etc/default/docker
+	@sudo sed -i -e '/http_proxy/d' -e '/https_proxy/d' /etc/default/docker
 	@sudo bash -c "{ echo \"export http_proxy=$$http_proxy\"; \
+	            echo \"export https_proxy=$$https_proxy\"; \
 	            echo \"export no_proxy=$$no_proxy\"; } >> /etc/default/docker"
 	@test x$(SONIC_CONFIG_USE_NATIVE_DOCKERD_FOR_BUILD) != x"y" && sudo service docker status &> /dev/null || ( sudo service docker start &> /dev/null && ./scripts/wait_for_docker.sh 60 )
 
@@ -979,7 +980,7 @@ $(addprefix $(TARGET_PATH)/, $(DOCKER_DBG_IMAGES)) : $(TARGET_PATH)/%-$(DBG_IMAG
 		docker build \
 			$(if $($*.gz_DBG_DEPENDS), --squash --no-cache, --no-cache) \
 			--build-arg http_proxy=$(HTTP_PROXY) \
-			--build-arg http_proxy=$(HTTP_PROXY) \
+			--build-arg https_proxy=$(HTTPS_PROXY) \
 			--build-arg no_proxy=$(NO_PROXY) \
 			--build-arg docker_container_name=$($*.gz_CONTAINER_NAME) \
 			--label com.azure.sonic.manifest="$$(cat $($*.gz_PATH)/manifest.json)" \