MVP build process

Doesn't push to the apt mirror yet, but it builds what I need to handle that step manually.

Closes #1

scripts/build.sh

@@ -51,7 +51,7 @@ git clone -q --recursive --depth 1 https://github.com/nginx/nginx.git -b "$NGINX
 # Configure nginx
 echo ""
 echo "CONFIGURE NGINX"
-cd "$NGINX_SRC_DIR" || exit
+cd "$NGINX_SRC_DIR" || exit 1
 
 ./auto/configure \
     --prefix=/etc/nginx \
@@ -97,5 +97,12 @@ cd "$NGINX_SRC_DIR" || exit
 echo ""
 echo "BUILDING NGINX"
 echo "Using $(nproc) jobs"
-make -j"$(nproc)"
-"$NGINX_SRC_DIR/objs/nginx -V"
+make
+
+if [[ ! -f "$NGINX_SRC_DIR/objs/nginx" ]]; then
+    exit 1
+fi
+
+# Verify build works
+cd "$NGINX_SRC_DIR/objs" || exit 1
+./nginx -V