[fix] CI: prevent race condition

`checker.yml` and `integration.yml` are the only workflows that are currently safe to be executed simultaneously, the others present a risk that the order of completion may not be expected. The ones that are chained from `integration.yml` can be called as many times as `integration.yml` workflows are running at that moment, the same with the trigger "workflow_dispatch".

This can be fatal for workflows like `container.yml` that use a centralized cache to store and load the candidate images in a common tag called "searxng-<arch>".

* For example, a `container.yml` workflow is executed after being chained from `integration.yml` (called "~1"), and seconds later it may be triggered again because another PR merged some breaking changes (called "~2"). While "~1" has already passed the test job successfully and is about to start the release job, "~2" finishes building the container and overwrites the references on the common tag. When "~1" in the release job loads the images using the common tag, it will load the container of "~2" instead of "~1" having skipped the whole test job process.

The example is only set for the container workflow, but the other workflows might occur in a similar way.

.github/workflows/checker.yml

@@ -8,7 +8,7 @@ on:
     - cron: "0 4 * * 5"
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref_name }}
+  group: ${{ github.workflow }}
   cancel-in-progress: false
 
 permissions:

.github/workflows/container.yml

@@ -13,7 +13,7 @@ on:
       - master
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref_name }}
+  group: ${{ github.workflow }}
   cancel-in-progress: false
 
 permissions:

.github/workflows/data-update.yml

@@ -8,7 +8,7 @@ on:
     - cron: "59 23 28 * *"
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref_name }}
+  group: ${{ github.workflow }}
   cancel-in-progress: false
 
 permissions:

.github/workflows/documentation.yml

@@ -12,7 +12,7 @@ on:
       - master
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref_name }}
+  group: ${{ github.workflow }}
   cancel-in-progress: false
 
 permissions:

.github/workflows/l10n.yml

@@ -15,7 +15,7 @@ on:
     - cron: "05 07 * * 5"
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref_name }}
+  group: ${{ github.workflow }}
   cancel-in-progress: false
 
 permissions:

.github/workflows/security.yml

@@ -8,7 +8,7 @@ on:
     - cron: "42 05 * * *"
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref_name }}
+  group: ${{ github.workflow }}
   cancel-in-progress: false
 
 permissions: