ci: move tests to bash scripts (#3648)

This improves maintenance because we can now use a regular matrix for
the integration tests and one can locally use tools like shellcheck or a
`bash-lsp` during development.

---------

Signed-off-by: Jamil <jamilbk@users.noreply.github.com>
Co-authored-by: Jamil <jamilbk@users.noreply.github.com>

scripts/tests/direct-ping-portal-down.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -e
+
+source "./scripts/tests/lib.sh"
+
+client_ping_gateway
+
+docker compose stop api relay # Stop portal & relay
+
+sleep 5 # Wait for client to disconnect
+
+client_ping_gateway

scripts/tests/direct-ping-portal-relay-down.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -e
+
+source "./scripts/tests/lib.sh"
+
+client_ping_gateway
+
+docker compose stop api # Stop portal
+
+sleep 5 # Wait for client to disconnect
+
+client_ping_gateway

scripts/tests/direct-ping-portal-restart.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -e
+
+source "./scripts/tests/lib.sh"
+
+client_ping_gateway
+
+docker compose restart api # Restart portal
+
+sleep 5 # Wait for client to reconnect
+
+client_ping_gateway

scripts/tests/lib.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+function install_iptables_drop_rules() {
+    sudo iptables -I FORWARD 1 -s 172.28.0.100 -d 172.28.0.105 -j DROP
+    sudo iptables -I FORWARD 1 -s 172.28.0.105 -d 172.28.0.100 -j DROP
+}
+
+function remove_iptables_drop_rules() {
+    sudo iptables -D FORWARD -s 172.28.0.100 -d 172.28.0.105 -j DROP
+    sudo iptables -D FORWARD -s 172.28.0.105 -d 172.28.0.100 -j DROP
+}
+
+function client_ping_gateway() {
+    docker compose exec -it client timeout 60 sh -c 'until ping -W 1 -c 10 172.20.0.100 &>/dev/null; do true; done'
+}

scripts/tests/relayed-ping-portal-down.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+set -e
+
+source "./scripts/tests/lib.sh"
+
+install_iptables_drop_rules
+trap remove_iptables_drop_rules EXIT # Cleanup after us
+
+client_ping_gateway
+
+docker compose stop api # Stop portal
+
+sleep 5 # Wait for client to disconnect
+
+client_ping_gateway

scripts/tests/relayed-ping-portal-restart.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+set -e
+
+source "./scripts/tests/lib.sh"
+
+install_iptables_drop_rules
+trap remove_iptables_drop_rules EXIT # Cleanup after us
+
+client_ping_gateway
+
+docker compose restart api # Restart portal
+
+sleep 5 # Wait for client to reconnect
+
+client_ping_gateway