README: Add CI status badges

Author: sjanc

.github/workflows/test_dump.yml

@@ -17,7 +17,7 @@
 # under the License.
 #
 
-name: Test commands
+name: Test dump
 
 on: [push, pull_request]
 

.github/workflows/test_upgrade.yml

@@ -17,7 +17,7 @@
 # under the License.
 #
 
-name: Test commands
+name: Test upgrade
 
 on: [push, pull_request]
 

README.md

@@ -19,6 +19,18 @@
 #
 -->
 
+<a href="https://github.com/apache/mynewt-newt/actions/workflows/test_commands.yml">
+  <img src="https://github.com/apache/mynewt-newt/actions/workflows/test_commands.yml/badge.svg">
+<a/>
+
+<a href="https://github.com/apache/mynewt-newt/actions/workflows/test_dump.yml">
+  <img src="https://github.com/apache/mynewt-newt/actions/workflows/test_dump.yml/badge.svg">
+<a/>
+
+<a href="https://github.com/apache/mynewt-newt/actions/workflows/test_upgrade.yml">
+  <img src="https://github.com/apache/mynewt-newt/actions/workflows/test_upgrade.yml/badge.svg">
+<a/>
+
 # Newt
 
 Apache Newt is a smart build and package management tool, designed for C and C++