Add swig support (#1265)

* added swig support

* removed apt-get update

* updated swig.sh

Co-authored-by: Nikita Bykov <v-nibyko@microsoft.com>

images/linux/scripts/installers/swig.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+# Source the helpers for use with the script
+source $HELPER_SCRIPTS/document.sh
+
+# Install Swig
+sudo apt-get install -y swig
+
+# Run tests to determine that the software installed as expected
+echo "Testing to make sure that script performed as expected, and basic scenarios work"
+if ! command -v swig; then
+    echo "Swig was not installed"
+    exit 1
+fi
+
+# Document what was added to the image
+echo "Lastly, documenting what we added to the metadata file"
+DocumentInstalledItem "Swig $(swig -version | sed -n 2p | cut -d ' ' -f 3)"