test images: Fixes Windows nginx images entrypoints

nginx expects to find its conf and logs folder locally, and fails if it cannot find them.
cd-ing into the the nginx folder solves this issue. This is a similar approach to the
echoserver image, which also uses nginx.

test/images/nginx-new/Dockerfile_windows

@@ -24,4 +24,4 @@ COPY --from=nginx-source /nginx /usr/share/nginx
 
 USER ContainerAdministrator
 EXPOSE 80
-ENTRYPOINT ["/usr/share/nginx/nginx.exe"]
+ENTRYPOINT ["/bin/sh", "-c", " cd /usr/share/nginx && ./nginx.exe"]

test/images/nginx-new/VERSION

@@ -1 +1 @@
-1.15-alpine
+1.15-1

test/images/nginx/Dockerfile_windows

@@ -24,4 +24,4 @@ COPY --from=nginx-source /nginx /usr/share/nginx
 
 USER ContainerAdministrator
 EXPOSE 80
-ENTRYPOINT ["/usr/share/nginx/nginx.exe"]
+ENTRYPOINT ["/bin/sh", "-c", " cd /usr/share/nginx && ./nginx.exe"]

test/images/nginx/VERSION

@@ -1 +1 @@
-1.14-alpine
+1.14-1