check for apt-get before installing jq

dist/entrypoint.sh

@@ -7,6 +7,27 @@
 ACTIVATE_LICENSE_PATH="$GITHUB_WORKSPACE/_activate-license"
 mkdir -p "$ACTIVATE_LICENSE_PATH"
 
+#
+# Check if apt-get is available if in package mode (if not, we must abort since we need to install jq)
+#
+if [ "$PACKAGE_MODE" = "true" ]; then
+  echo "Running tests on a Unity package rather than a Unity project."
+  echo "Checking if apt-get is installed."
+  apt-get --version > /dev/null 2>&1
+  if [ $? -ne 0 ]; then
+    echo "apt-get is not installed. Aborting..."
+    exit
+  fi
+
+  # install jq
+  apt-get update \
+    &&  apt-get upgrade -y --force-yes \
+    &&  apt-get install -y --force-yes \
+        jq \
+    &&  apt-get clean \
+    &&  rm -rf /var/cache/apt/archives/* /var/lib/apt/lists/*
+fi
+
 #
 # Run steps
 #