fixup building imagecompare inside a container

container/run.sh

@@ -44,6 +44,7 @@ git_short() {
 
 render-test() {
 	local OUTPUT="${HLRTEST_REPO_DIR}/render/work"
+	mkdir -p "${OUTPUT}"
 
 	local HLRTEST_REVISION=$(git_short "${HLRTEST_REPO_DIR}")
 	local XASH3D_REVISION=$(git_short "${XASH3D_RT_REPO_DIR}")
@@ -74,7 +75,7 @@ render-test() {
 		\
 		-v ${XASH3D_RT_REPO_DIR}:/build/xash3d-fwgs:O \
 		\
-		-v ${HLRTEST_REPO_DIR}:/build/HLRTest:ro \
+		-v ${HLRTEST_REPO_DIR}:/build/HLRTest:O \
 		-v ${OUTPUT}:/build/HLRTest/render/work \
 		\
 		ubuntu-xash-builder:latest \

render/Makefile

@@ -1,2 +1,2 @@
 imagecompare: imagecompare.c stb_image.h stb_image_write.h Makefile
-	${CC} -O3 -ggdb3 -march=native -Wall -Werror -pedantic -lm -o imagecompare imagecompare.c
+	${CC} -O3 -ggdb3 -march=native -Wall -Werror -pedantic -o imagecompare imagecompare.c -lm