Massive architectural rework

This commit massively overhauls the project's structure to simplify
development. Most parts are now correctly compartmentalized and
dependencies are passed in a sane way rather than global variables
galore xd.

internal/docker/docker.go

@@ -0,0 +1,29 @@
+package docker
+
+import (
+	"github.com/docker/docker/client"
+	"go.uber.org/zap"
+)
+
+type DockerID string
+
+// structure that holds the docker daemon information
+type DockerClient struct {
+	client *client.Client
+	logger *zap.SugaredLogger
+}
+
+func NewDocker(rawDockerClient *client.Client, logger *zap.SugaredLogger) *DockerClient {
+	if rawDockerClient == nil {
+		var err error
+		rawDockerClient, err = client.NewClientWithOpts(client.FromEnv)
+		if err != nil {
+			logger.Fatalw("Failed to create docker client", zap.Error(err))
+		}
+	}
+
+	return &DockerClient{
+		client: rawDockerClient,
+		logger: logger,
+	}
+}