Update building stuff

- Add a Makefile with common targets (binary, test, validate, ..)
- Use docker to build it (isolated)

And update circleci to work with the new Makefile..

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

script/make.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+set -e
+
+# List of bundles to create when no argument is passed
+DEFAULT_BUNDLES=(
+	validate-gofmt
+	binary
+
+	test-unit
+	test-integration
+)
+
+bundle() {
+    local bundle="$1"; shift
+    echo "---> Making bundle: $(basename "$bundle") (in $DEST)"
+    source "script/$bundle" "$@"
+}
+
+if [ $# -lt 1 ]; then
+    bundles=(${DEFAULT_BUNDLES[@]})
+else
+    bundles=($@)
+fi
+for bundle in ${bundles[@]}; do
+    export DEST=.
+    ABS_DEST="$(cd "$DEST" && pwd -P)"
+    bundle "$bundle"
+    echo
+done