website: Render versions under /data/versions.json (#7783)

This will facilitate other sites checking the current version of the OPA
website.

Signed-off-by: Charlie Egan <charlie@styra.com>

docs/.gitignore

@@ -2,3 +2,6 @@
 build
 node_modules*
 package-lock.json
+
+# this is generated by the build process
+static/data/versions.json

docs/docusaurus.config.js

@@ -445,6 +445,13 @@ The Linux Foundation has registered trademarks and uses trademarks. For a list o
             const { versions } = content;
 
             await createData("versions.json", JSON.stringify(versions, null, 2));
+
+            const staticDir = path.join(context.siteDir, "static", "data");
+            await fs.mkdir(staticDir, { recursive: true });
+            await fs.writeFile(
+              path.join(staticDir, "versions.json"),
+              JSON.stringify(versions, null, 2),
+            );
           },
         };
       },

netlify.toml

@@ -20,3 +20,12 @@ function = "badge"
 [[edge_functions]]
 path = "/docs/*"
 function = "version-redirect"
+
+# /data/versions.json is used by versioned OPA deployments to determine
+# if what the latest release is, how outdated they are.
+[[headers]]
+for = "/data/versions.json"
+[headers.values]
+Access-Control-Allow-Origin = "https://*.netlify.app"
+Access-Control-Allow-Methods = "GET, OPTIONS"
+Access-Control-Allow-Headers = "Content-Type"