[install] reenable all workflows

Revert "[install] TEMPORARELY disable all workflows but archiver.yml while debugging the latter (avoid overloading the CI)"
This reverts commit ef64378.

.github/workflows/c-cpp.yml

@@ -1,10 +1,10 @@
 name: C/C++ CI
 
 on:
-  #push:
-  #  branches: [ master ]
-  #pull_request:
-  #  branches: [ master ]
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
 
 jobs:
   debug_builds:

.github/workflows/madgraph_launch_test.yml

@@ -8,9 +8,9 @@ name: running acceptance test
 #    branches: [ main LTS ]
 on:
   # Triggers the workflow on push or pull request events but only for the 3.4.0 branch
-#  push:
-#    paths-ignore:
-#      - 'docs/**'
+  push:
+    paths-ignore:
+      - 'docs/**'
 #      - '.github/**'
 
   # Allows you to run this workflow manually from the Actions tab

.github/workflows/testsuite_allprocesses.yml

@@ -15,8 +15,8 @@ on:
   workflow_dispatch:
 
   # Trigger the all-processes workflow for pull requests to master
-  #pull_request:
-  #  branches: [ master ]
+  pull_request:
+    branches: [ master ]
 
   # Trigger the all-processes workflow when new changes to the workflow are pushed
   # (NB: this is now disabled to avoid triggering two jobs when pushing to a branch for which a PR is opened)