fix: minor usage fixes (#18)

- Moved action.yml to top level to make it easier to reference. 
- Fixed issue with curl not following redirects
- Incremented the RELEASE_VERSION - this needs a better long term
solution so that we don't have to increment this file every time we tag
a new release. Will solve this in a follow up.

Author: bradegler

.github/actions/secure-setup-terraform/action.yml renamed to action.yml

@@ -31,11 +31,11 @@ runs:
     - name: 'download-artifacts'
       shell: 'bash'
       env:
-        RELEASE_VERSION: '0.1.0'
+        RELEASE_VERSION: '0.2.1'
         RELEASE_LOCATION: 'https://github.com/abcxyz/secure-setup-terraform/releases/tag'
       run: |-
-        curl -H "Authorization: token ${{ github.token }}" -O "${{env.RELEASE_LOCATION}}/v${{env.RELEASE_VERSION}}/secure-setup-terraform_${{env.RELEASE_VERSION}}_linux_amd64.tar.gz"
-        curl -H "Authorization: token ${{ github.token }}" -o terraform-checksums.json "${{env.RELEASE_LOCATION}}/v${{env.RELEASE_VERSION}}/secure-setup-terraform_${{env.RELEASE_VERSION}}_checksums.json"
+        curl -H "Authorization: token ${{ github.token }}" -LO "${{env.RELEASE_LOCATION}}/v${{env.RELEASE_VERSION}}/secure-setup-terraform_${{env.RELEASE_VERSION}}_linux_amd64.tar.gz"
+        curl -H "Authorization: token ${{ github.token }}" -Lo terraform-checksums.json "${{env.RELEASE_LOCATION}}/v${{env.RELEASE_VERSION}}/secure-setup-terraform_${{env.RELEASE_VERSION}}_checksums.json"
         tar xf secure-setup-terraform_${{env.RELEASE_VERSION}}_linux_amd64.tar.gz
 
     # Recursively search for terraform files in the current repo and run a linter that fails when it finds calls to 'local-exec'