Permission denied when restoring cache

[enell]

Orb version

3.0.1

What happened

Permission denied when restoring cache in the yarn_install command

Size: 278 MiB
Cached paths:
  * /root/.cache/yarn

Downloading cache archive...
Validating cache...

Unarchiving cache...

Failed to unarchive cache

Error untarring cache: Error extracting tarball /tmp/cache468968038 : tar: root/.cache/yarn: Cannot mkdir: Permission denied tar: root/.cache/yarn/v6: Cannot mkdir: Permission denied tar: root/.cache/yarn/v6/.tmp: Cannot mkdir: Permission denied tar: root/.cache/yarn/v6/npm-@babel-code-frame-7.8.3-33e25903d7481181534e12ec0a25f16b6fcf419e-integrity: Cannot mkdir: Permission denied tar: root/.cache/yarn/v6/npm-@babel-code-frame-7.8.3-33e25903d7481181534e12ec0a25f16b6fcf419e-integrity/node_modules: Cannot mkdir: Permission denied tar: root/.cache/yarn/v6/npm-@babel-code-frame-7.8.3-33e25903d7481181534e12ec0a25f16b6fcf419e-integrity/node_modules/@babel: Cannot mkdir: Permission denied tar: root/.cache/yarn/v6/npm-@babel-code-frame-7.8.3-33e25903d7481181534e12ec0a25f16b6fcf419e-integrity/node_modules/@babel/code-frame: Cannot mkdir: Permission denied tar: root/.cache/yarn/v6/npm-@babel-code-frame-7.8.3-33e25903d7481181534e12ec0a25f16b6fcf419e-integrity/node_modules/@babel/code-frame/.yarn-metadata.json: Cannot open: Permission denied tar: root/.cache/yarn/v6/npm-@babel-code-frame-7.: exit status 2

Expected behavior

Should be able to restore cache without issue.

yarn install is using ~/.cache/yarn as cache folder and this will depend on what the user is on the executer that is running the job. Consider using cache folder relative to the workspace or the system tmp folder (/tmp/) instead