Build operator-sdk from forked source

Released operator-sdk binary does not support running bundle image from
local insecure registry. The fix has submitted to upstream:

operator-framework/operator-sdk#4816

Till this fix is available in release binary we have to build from
source.

operator/operator.make

@@ -3,7 +3,13 @@ OPERATOR_SDK_VERSION=1.6.1
 # download operator-sdk binary
 _work/bin/operator-sdk-$(OPERATOR_SDK_VERSION):
 	mkdir -p _work/bin/ 2> /dev/null
-	curl -L https://github.com/operator-framework/operator-sdk/releases/download/v$(OPERATOR_SDK_VERSION)/operator-sdk_linux_amd64 -o $(abspath $@)
+	# Building operator-sdk from sources as that needs fixes for:
+	# https://github.com/operator-framework/operator-sdk/pull/4816
+	tmpdir=`mktemp -d` && \
+	trap 'set -x; rm -rf $$tmpdir' EXIT && \
+	git clone --branch $(OPERATOR_SDK_VERSION)+fixes https://github.com/avalluri/operator-sdk.git $$tmpdir && \
+	cd $$tmpdir && $(MAKE) build/operator-sdk && \
+	cp $$tmpdir/build/operator-sdk $(abspath $@) && \
 	chmod a+x $(abspath $@)
 	cd $(dir $@); ln -sf operator-sdk-$(OPERATOR_SDK_VERSION) operator-sdk