ci: Define concurrency groups for cancelling duplicate jobs

This commit will force running jobs of a given PR to be cancelled once
the same branch is updated, avoiding the CI wasting time testing
outdated content.

Signed-off-by: Gustavo Henrique Nihei <gustavo.nihei@espressif.com>

.github/workflows/espressif.yaml

@@ -10,6 +10,10 @@ on:
 
 name: Espressif
 
+concurrency:
+  group: espressif-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   environment:
     strategy:

.github/workflows/fih_tests.yaml

@@ -6,6 +6,10 @@ on:
 
 name: FIH hardening
 
+concurrency:
+  group: fih-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   config:
     strategy:

.github/workflows/imgtool.yaml

@@ -6,6 +6,10 @@ on:
 
 name: imgtool
 
+concurrency:
+  group: imgtool-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   environment:
     runs-on: ubuntu-latest

.github/workflows/mynewt.yaml

@@ -7,6 +7,10 @@ on:
 
 name: Mynewt
 
+concurrency:
+  group: mynewt-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   environment:
     runs-on: ubuntu-latest

.github/workflows/sim.yaml

@@ -7,6 +7,10 @@ on:
 
 name: Sim
 
+concurrency:
+  group: sim-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   environment:
     strategy: