CI: Skip jobs arm-08 to arm-14 when a Complex PR is created / updated

When we submit or update a Complex PR that affects All Architectures (Arm, RISC-V, Xtensa, etc): CI Workflow shall run only half the jobs. Previously CI Workflow will run `arm-01` to `arm-14`, now we will run only `arm-01` to `arm-07`.

When the Complex PR is Merged: CI Workflow will still run all jobs `arm-01` to `arm-14`

Simple PRs with One Single Arch / Board will build the same way as before: `arm-01` to `arm-14`

This is explained here: apache#14376

Note that this version of `arch.yml` has diverged from `nuttx-apps`, since we are unable to merge apache#14377

.github/workflows/arch.yml

@@ -153,6 +153,15 @@ jobs:
 
           # If Not a Simple PR: Build all targets
           if [[ "$quit" == "1" ]]; then
+            # If PR was Created or Modified: Exclude arm-08 to arm-14
+            pr=${{github.event.pull_request.number}}
+            if [[ "$pr" != "" ]]; then
+              echo "Excluding arm-08 to arm-14"
+              boards=$( 
+                echo '${{ inputs.boards }}' |
+                jq --compact-output 'map(select(test("arm-0[8-9]") == false and test("arm-1.+") == false))'
+              )
+            fi
             echo "selected_builds=$boards" | tee -a $GITHUB_OUTPUT
             exit
           fi