GitHub Actions: testing against ns-3.35, ns-3.40, ns-3.41

.github/workflows/ns-3.35.yml

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+on:
+  push:
+    branches:
+      - 'tests'
+
+jobs:
+  ns3_check:
+    runs-on: ubuntu-latest
+    name: Compatibility ns-3.35 (Ubuntu 18.04)
+    steps:
+      - name: ns3-compatibility-action
+        uses: emanuelegiona/ns3-compatibility-action@v1.0.0
+        with:
+          ns3_docker_img: egiona/ns3-base:u18.04-n3.35
+          test_script: run-tests.sh

.github/workflows/ns-3.40.yml

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+on:
+  push:
+    branches:
+      - 'tests'
+
+jobs:
+  ns3_check:
+    runs-on: ubuntu-latest
+    name: Compatibility ns-3.40 (Ubuntu 20.04)
+    steps:
+      - name: ns3-compatibility-action
+        uses: emanuelegiona/ns3-compatibility-action@v1.0.0
+        with:
+          ns3_docker_img: egiona/ns3-base:u20.04-n3.40
+          test_script: run-tests.sh

.github/workflows/ns-3.41.yml

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+on:
+  push:
+    branches:
+      - 'tests'
+
+jobs:
+  ns3_check:
+    runs-on: ubuntu-latest
+    name: Compatibility ns-3.41 (Ubuntu 22.04)
+    steps:
+      - name: ns3-compatibility-action
+        uses: emanuelegiona/ns3-compatibility-action@v1.0.0
+        with:
+          ns3_docker_img: egiona/ns3-base:u22.04-n3.41
+          test_script: run-tests.sh

run-tests.sh

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+#!/bin/bash
+
+# Prepare output files
+OUTCOME=1
+echo "${OUTCOME}" > /home/exit-code.txt
+echo "ext-process: Test not run" > /home/test-output.txt
+
+# Install module into ns-3 "contrib" tree using the Makefile (assumption: working directory is the same as this file)
+OUTCOME=1
+cp -r ext-process /home/
+cd /home
+
+# Update path to external process's launcher file in test file
+sed -i 's%^\(  std::string launcherPath = \).*$%\1'"\"${NS3_DEBUG_DIR}/contrib/ext-process/launcher-py.sh\";"'%' /home/ext-process/test/ext-process-test-suite.cc
+
+# Ensure debug profile _before_ copying module
+export NS3_CURR_PROFILE=${NS3_DEBUG_DIR}
+make sync_module FILE=ext-process
+
+# Necessary to avoid killing docker parent processes (build scripts send USR1 signal in interactive shells)
+trap "echo Ignoring USR1" USR1
+./build-debug.sh && OUTCOME=0
+
+if [[ "$OUTCOME" -eq 1 ]]; then
+    echo "Error: build failed"
+else
+    # Run module-specific tests and retain their outputs
+    OUTCOME=1
+    make test SUITE=ext-process LOG=/home/test-output && \
+    OUTCOME=0
+
+    if [[ "$OUTCOME" -eq 1 ]]; then
+        echo "Error: tests failed"
+    fi
+fi
+
+# Only return success if all previous commands executed correctly
+echo "${OUTCOME}" > /home/exit-code.txt
+
+# === No exit here ===
+# Avoids exiting the entrypoint sub-script from GitHub action that sources this file