make cache dir to prevent build failures

Some tools don’t think to `mkdir -p` directories that are usually there.
Refs pkgxdev/pantry#4807

Author: mxcl

bin/cmd/build

@@ -121,6 +121,8 @@ if (env['GITHUB_TOKEN']) {
   env['GH_TOKEN'] = env['GITHUB_TOKEN']
 }
 
+config.path.cache.mkdir('p')  // we’ve indeed found things to break without this
+
 const proc = new Deno.Command(script.string, {clearEnv: true, env}).spawn()
 const rv = await proc.status
 if (!rv.success) throw new Error(`${rv.code} ${rv.signal}`)

bin/cmd/test

@@ -99,6 +99,8 @@ if (env['GITHUB_TOKEN']) {
   env['GH_TOKEN'] = env['GITHUB_TOKEN']
 }
 
+config.path.cache.mkdir('p')  // we’ve indeed found things to break without this
+
 const proc = new Deno.Command(script.string, {clearEnv: true, env}).spawn()
 const rv = await proc.status
 if (!rv.success) throw new Error(`${rv.code} ${rv.signal}`)

projects/version-transformer.com/package.yml

@@ -8,4 +8,10 @@ build:
     echo {{version}} > VERSION
 
 test:
-  test $(cat {{prefix}}/VERSION) = {{version}}
+  - test $(cat {{prefix}}/VERSION) = {{version}}
+
+  # test that cache directories are created in our sandbox
+  - run: touch ~/.cache/foo
+    if: linux
+  - run: touch ~/Library/Caches/foo
+    if: darwin