Add digger workflow

[skluck]

Testing allowed github actions in this org. Note that the repo must be public to use this feature on the free org plan.

[skluck]

With this list of allowed actions:

autero1/action-terragrunt@aefb0a43c4f5503a91fefb307745c4d51c26ed0e,
diggerhq/digger@bd1a54120e1fe0e410e84b6d9a5e9bbcce7f3897,
opentofu/setup-opentofu@592200bd4b9bbf4772ace78f887668b1aee8f716,
rhythmictech/actions-setup-tfenv@ef1296cdbec243306d3a3d31909582ca1eeb4627,

and enabling

• Allow actions created by GitHub
• Allow actions by Marketplace verified creators

This action runs fine:

 Download action repository 'actions/checkout@v4' (SHA:08eba0b27e820071cde6df949e0beb9ba4906955)
Download action repository 'diggerhq/digger@bd1a54120e1fe0e410e84b6d9a5e9bbcce7f3897' (SHA:bd1a54120e1fe0e410e84b6d9a5e9bbcce7f3897)
Getting action download info
Download action repository 'actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955' (SHA:08eba0b27e820071cde6df949e0beb9ba4906955)
Download action repository 'google-github-actions/auth@c200f3691d83b41bf9bbd8638997a462592937ed' (SHA:c200f3691d83b41bf9bbd8638997a462592937ed)
Download action repository 'google-github-actions/setup-gcloud@e427ad8a34f8676edf47cf7d7925499adf3eb74f' (SHA:e427ad8a34f8676edf47cf7d7925499adf3eb74f)
Download action repository 'aws-actions/configure-aws-credentials@7474bc4690e29a8392af63c5b98e7449536d5c3a' (SHA:7474bc4690e29a8392af63c5b98e7449536d5c3a)
Download action repository 'azure/login@6c251865b4e6290e7b78be643ea2d005bc51f69a' (SHA:6c251865b4e6290e7b78be643ea2d005bc51f69a)
Download action repository 'actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830' (SHA:0057852bfaa89a56745cba8c7296529d2fc39830)
Download action repository 'hashicorp/setup-terraform@b9cd54a3c349d3f38e8881555d616ced269862dd' (SHA:b9cd54a3c349d3f38e8881555d616ced269862dd)
Download action repository 'rhythmictech/actions-setup-tfenv@ef1296cdbec243306d3a3d31909582ca1eeb4627' (SHA:ef1296cdbec243306d3a3d31909582ca1eeb4627)
Download action repository 'autero1/action-terragrunt@aefb0a43c4f5503a91fefb307745c4d51c26ed0e' (SHA:aefb0a43c4f5503a91fefb307745c4d51c26ed0e)
Download action repository 'opentofu/setup-opentofu@592200bd4b9bbf4772ace78f887668b1aee8f716' (SHA:592200bd4b9bbf4772ace78f887668b1aee8f716)
Download action repository 'pulumi/actions@a3f382e1242b69ab33854c253c3b580f1226348e' (SHA:a3f382e1242b69ab33854c253c3b580f1226348e)
Download action repository 'actions/setup-go@d35c59abb061a4a6fb18e82ac0862c26744d6ab5' (SHA:d35c59abb061a4a6fb18e82ac0862c26744d6ab5)
Download action repository 'actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b' (SHA:f28e40c7f34bde8b3046d885e986cb6290c5673b)