make action caches immutable

[ericLemanissier]

Description:
With this change, caches become immutable by appending the workflow run_id, which makes the actual key unique (appart from re-run)
The cache restore works because the primaryKey is a prefix anyway: https://github.com/actions/toolkit/blob/1b1e81526b802d1d641911393281c2fb45ed5f11/packages/cache/src/cache.ts#L67

This follows recommendations from https://github.com/actions/cache/blob/main/tips-and-workarounds.md#update-a-cache

Unused caches are removed after 7 days by github:
https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/caching-dependencies-to-speed-up-workflows#usage-limits-and-eviction-policy

This avoids users having to define unneeded permission actions: write

The problem with deleting a cache entry is that it requires to give actions: write permissions, which means the workflow has all these permissions and this is way too much, and not acceptable for a lot of projects.

CI results available in https://github.com/ericLemanissier/stale/pull/71/checks

Related issue:
fixes #1159
fixes #1133
fixes #1131

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Alberto2101b]

Description: With this change, caches become immutable by appending the workflow run_id, which makes the actual key unique (appart from re-run) The cache restore works because the primaryKey is a prefix anyway: https://github.com/actions/toolkit/blob/1b1e81526b802d1d641911393281c2fb45ed5f11/packages/cache/src/cache.ts#L67

This follows recommendations from https://github.com/actions/cache/blob/main/tips-and-workarounds.md#update-a-cache

Unused caches are removed after 7 days by github: https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/caching-dependencies-to-speed-up-workflows#usage-limits-and-eviction-policy

This avoids users having to define unneeded permission actions: write

The problem with deleting a cache entry is that it requires to give actions: write permissions, which means the workflow has all these permissions and this is way too much, and not acceptable for a lot of projects.

CI results available in https://github.com/ericLemanissier/stale/pull/71/checks

Related issue: fixes #1159 fixes #1133 fixes #1131

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

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