Merge #1719: ci: DRY workflow using anchors

15d0148 ci: Drop default for `inputs.command` in `run-in-docker-action` (Hennadii Stepanov)
1decc49 ci: Use YAML anchor and aliases for repeated "CI script" steps (Hennadii Stepanov)
dff1bc1 ci, refactor: Generalize use of `matrix.configuration.env_vars` (Hennadii Stepanov)
4b644da ci: Use YAML anchor and aliases for repeated "Print logs" steps (Hennadii Stepanov)
a889cd9 ci: Bump `actions/checkout` version (Hennadii Stepanov)
574c2f3 ci: Use YAML anchor and aliases for repeated "Checkout" steps (Hennadii Stepanov)

Pull request description:

  GHA YAML parser now [supports](actions/runner#1182 (comment)) anchors.

  This PR makes use of that support to [DRY](https://en.wikipedia.org/wiki/Don%27t_repeat_yourself) the workflow code.

ACKs for top commit:
  real-or-random:
    utACK 15d0148

Tree-SHA512: a25a226fec0053242bc46b8c9815067a35af632cfbffefcc5cd4c96a67c0535dde447753099cbc74ecc64072d36aef2aa78c105b66f43cb3134ffa1ae60dca1e

Author: real-or-random

.github/actions/run-in-docker-action/action.yml

@@ -10,8 +10,7 @@ inputs:
     default: ${{ runner.arch }}
   command:
     description: 'A command to run in a container'
-    required: false
-    default: ./ci/ci.sh
+    required: true
 runs:
   using: "composite"
   steps: