docs: add tests

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

docker-bake.hcl

@@ -111,3 +111,9 @@ target "docs-image" {
   output = ["type=docker"]
   tags = ["registry-docs:local"]
 }
+
+target "docs-test" {
+  inherits = ["_common_docs"]
+  target = "test"
+  output = ["type=cacheonly"]
+}

dockerfiles/docs.Dockerfile

@@ -26,3 +26,10 @@ EXPOSE 1313
 
 FROM scratch AS out
 COPY --from=build /out /
+
+FROM wjdp/htmltest:v0.17.0 AS test
+WORKDIR /test
+COPY --from=build /out ./public
+ADD docs/.htmltest.yml .htmltest.yml
+RUN --mount=type=cache,target=tmp/.htmltest \
+    htmltest

docs/.htmltest.yml

@@ -0,0 +1,9 @@
+DirectoryPath: "public"
+EnforceHTTPS: true
+CheckDoctype: true
+CheckExternal: true
+IgnoreAltMissing: true
+IgnoreAltEmpty: true
+IgnoreEmptyHref: true
+IgnoreInternalEmptyHash: true
+IgnoreDirectoryMissingTrailingSlash: true