Add a few linter tools that need to be set up with system

assets/default/bin/hadolint

@@ -0,0 +1,11 @@
+#! /bin/bash
+
+# Runs hadolint from a Docker image
+
+version=v1.17.2
+
+docker run -i --rm \
+    -v `pwd`:/data \
+    -w /data \
+    hadolint/hadolint:${version}-debian \
+    hadolint $*

recipes/default/packages

@@ -1,7 +1,7 @@
 #! /bin/bash
 
 sudo_package_update
-packages="tmux htop curl wget mercurial ctags tig pv jq fish mosh bash-completion doxygen"
+packages="tmux htop curl wget mercurial ctags tig pv jq fish mosh bash-completion doxygen shellcheck"
 
 # This now installs a lot of language specific stuff from python, gradle, to go.
 # Should consider pulling these into different recipes that are dependent on the environment