cache-domains: added pre-test.sh CI step

Some packages variants have conflicting dependencies with the
base packages and the CI test will fail to install before anything
can be done by the packages to setup the system for install.

This change adds a pre-test.sh that runs before the install so things
like the default libustream variant can be swapped out as shown in the
updated cache-domains.

Signed-off-by: Gerard Ryan <G.M0N3Y.2503@gmail.com>
(cherry picked from commit 61997c86b01c83320a2cbb1b490941a8af741253)

.github/workflows/entrypoint.sh

@@ -26,10 +26,24 @@ for PKG in /ci/*.ipk; do
 
 	echo "Testing package $PKG_NAME in version $PKG_VERSION from $PKG_SOURCE"
 
-	opkg install "$PKG"
-
 	export PKG_NAME PKG_VERSION CI_HELPER
 
+	PRE_TEST_SCRIPT=$(find /ci/ -name "$PKG_SOURCE" -type d)/pre-test.sh
+
+	if [ -f "$PRE_TEST_SCRIPT" ]; then
+		echo "Use package specific pre-test.sh"
+		if sh "$PRE_TEST_SCRIPT" "$PKG_NAME" "$PKG_VERSION"; then
+			echo "Pre-test successful"
+		else
+			echo "Pre-test failed"
+			exit 1
+		fi
+	else
+		echo "No pre-test.sh script available"
+	fi
+
+	opkg install "$PKG"
+
 	TEST_SCRIPT=$(find /ci/ -name "$PKG_SOURCE" -type d)/test.sh
 
 	if [ -f "$TEST_SCRIPT" ]; then