build(test): restrict gdb-15 install to amd64 architecture (#114)

PR #71 updates gdb to a newer version that supports reading DWARF debugging
format. However, it incorrectly attempts to install the x86_64 version
regardless of the system's architecture, causing errors on non-x86_64 platforms.

This fix temporarily ensures that the updated gdb is only installed on x86_64
(amd64) systems.

test/services/nginx/install_tools.sh

@@ -2,6 +2,20 @@
 
 set -e
 
+get_architecture() {
+    case "$(uname -m)" in
+      aarch64|arm64)
+        echo "arm64"
+        ;;
+      x86_64|amd64)
+        echo "amd64"
+        ;;
+      *)
+        echo ""
+        ;;
+    esac
+}
+
 install_nginx_on_amazon_linux() {
     # Older versions of Amazon Linux needed "amazon-linux-extras" in order to
     # install nginx. Newer versions of Amazon Linux don't have
@@ -25,10 +39,13 @@ if command -v apt-get >/dev/null 2>&1; then
 
     if grep ^11\. /etc/debian_version; then
         # the version of gdb is too old and can't handle dwarf data generated by clang 16
-        apt-get install -y wget
-        wget -O /tmp/gdb.deb https://sqreen-ci-java.s3.amazonaws.com/deb-ad-hoc/bullseye/gdb_15.1-1_amd64.deb
-        dpkg -i /tmp/gdb.deb
-        rm /tmp/gdb.deb
+        ARCH="$(get_architecture)"
+        if [ "$ARCH" = "amd64" ]; then
+          apt-get install -y wget
+          wget -O /tmp/gdb.deb https://sqreen-ci-java.s3.amazonaws.com/deb-ad-hoc/bullseye/gdb_15.1-1_amd64.deb
+          dpkg -i /tmp/gdb.deb
+          rm /tmp/gdb.deb
+        fi
     fi
 elif command -v apk >/dev/null 2>&1; then
     apk update