ci: github: Restrict permissions for actions, test update commit status

Observed issue is:

    Run actions/github-script@v7
    (...)
    RequestError [HttpError]: Resource not accessible by integration
    (...)
    status: 403,
    response: {
    (...)
    request: {
    method: 'POST',
    url: 'https://api.github.com/repos/SiliconLabsSoftware/z-wave-protocol-controller/statuses/***',
    (...)

This is caused by the repo configuration (in actions):

    "Workflow permissions" : "Read repository contents and packages permissions"

Which is more restrictive that default:

    "Workflow permissions" : "Read and write permissions"

There is no need to set perm in token anymore.

Extra note, to some extends tokens may be replaced with GH apps.

Origin: SiliconLabsSoftware#105
Relate-to: https://docs.github.com/en/rest/commits/statuses?apiVersion=2022-11-28#create-a-commit-status
Relate-to:SiliconLabsSoftware#67
Relate-to: https://github.com/SiliconLabsSoftware/z-wave-protocol-controller/settings/actions
Signed-off-by: Philippe Coval <philippe.coval@silabs.com>

Author: rzr

.github/workflows/build-rootfs.yml

@@ -8,6 +8,8 @@ on:  # yamllint disable-line rule:truthy
       - '*'
 jobs:
   build:
+    permissions:
+      contents: read
     runs-on: ubuntu-24.04
     strategy:
       matrix:

.github/workflows/build.yml

@@ -10,6 +10,8 @@ on:  # yamllint disable-line rule:truthy
 
 jobs:
   build:
+    permissions:
+      contents: read
     env:
       project-name: z-wave-protocol-controller  # Align to docker (lowercase)
     runs-on: ubuntu-22.04

.github/workflows/test.yml

@@ -16,6 +16,9 @@ on:  # yamllint disable-line rule:truthy
 
 jobs:
   test:
+    permissions:
+      contents: read
+      statuses: write
     env:
       project-name: z-wave-protocol-controller  # Align to docker (lowercase)
     runs-on: ubuntu-24.04