Fix upstream build maybe (#858)

Co-authored-by: Steven Smith <[email protected]>

Author: stevsmit

build_docs

@@ -15,6 +15,8 @@ asciidoctor -a productname="Project Quay" -a toc="left" -d book upgrade_quay/mas
 asciidoctor -a productname="Project Quay" -a toc="left" -d book use_quay/master.adoc -D dist -o use_quay.html
 asciidoctor -a productname="Project Quay" -a toc="left" -d book api/master.adoc -D dist -o api_quay.html
 
+asciidoctor -a productname="Project Quay" -a toc="left" -d book quay_io/master.adoc -D dist -o quay_io.html
+
 asciidoctor -a productname="Project Quay" -a toc="left" -d book build_quay/master.adoc -D dist -o build_quay.html
 
 cp -a images dist/images

welcome.adoc

@@ -38,5 +38,7 @@ xref:use_quay.adoc[Use {productname}]
 
 xref:api_quay.adoc[{productname} API Guide]
 
+xref:quay_io.adoc[{quayio}]
+
 
 NOTE: Help make {productname} docs better on https://github.com/quay/quay-docs[github]