Split off cli into separate binaries (#37)

* 🎨 Split off cli into separate binaries

This commit splits off the cli into 3 binaries:
- agent
- cli
- provider

The provider now is a separate component that can be tested by itself
and have its own lifecycle. This paves the way to a ligher c3os variant,
HA support and other features that can be provided on runtime.

This is working, but still there are low hanging fruit to care about.

Fixes #14

* 🤖 Add provider bin to releases

* ⚙️ Handle signals

* ⚙️ Reduce buildsize footprint

* 🎨 Scan for providers also in /system/providers

* 🤖 Run goreleaser

* 🎨 Refactoring

internal/cmd/utils.go

@@ -0,0 +1,33 @@
+package cmd
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/c3os-io/c3os/internal/c3os"
+	"github.com/c3os-io/c3os/internal/utils"
+	"github.com/pterm/pterm"
+)
+
+func PrintTextFromFile(f string, banner string) {
+	installText := ""
+	text, err := ioutil.ReadFile(f)
+	if err == nil {
+		installText = string(text)
+	}
+	pterm.DefaultBox.WithTitle(banner).WithTitleBottomRight().WithRightPadding(0).WithBottomPadding(0).Println(
+		installText)
+}
+
+func PrintBranding(b []byte) {
+	brandingFile := c3os.BrandingFile("banner")
+	if _, err := os.Stat(brandingFile); err == nil {
+		f, err := ioutil.ReadFile(brandingFile)
+		if err == nil {
+			fmt.Println(string(f))
+		}
+
+	}
+	utils.PrintBanner(b)
+}