ci: update workflows names and add more badges

Fix workflows names on yaml root to be able to use them to refer to the
workflow. Add badges for pypi, workflows and license.

Signed-off-by: Fabio Utzig <fabio.utzig@nordicsemi.no>

.github/workflows/imgtool.yaml

@@ -3,19 +3,20 @@ on:
     branches:
       - master
 
+name: imgtool
+
 jobs:
   environment:
-    name: Publish imgtool releases
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
       with:
         fetch-depth: 0
-    - name: Install publishing packages
+    - name: Install packages
       run: |
         export PATH="$HOME/.local/bin:$PATH"
         ./ci/imgtool_install.sh
-    - name: Publish imgtool
+    - name: Publish
       env:
         TWINE_TOKEN: ${{ secrets.TWINE_TOKEN }}
       run: |

.github/workflows/mynewt.yaml

 # For development, trigger this on any push.
 on: [pull_request]
 
+name: Mynewt
+
 jobs:
   environment:
-    name: Mynewt build
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2

.github/workflows/sim.yaml

 # For development, trigger this on any push.
 on: [pull_request]
 
+name: Sim
+
 jobs:
   environment:
     strategy:
@@ -20,7 +22,6 @@ jobs:
         - "sig-rsa validate-primary-slot overwrite-only large-write"
         - "sig-ecdsa enc-ec256 validate-primary-slot"
         - "sig-rsa validate-primary-slot overwrite-only downgrade-prevention"
-    name: Sim
     runs-on: ubuntu-latest
     env:
       MULTI_FEATURES: ${{ matrix.features }}

README.md

 # [mcuboot](http://mcuboot.com/)
 
+[![Package on PyPI](https://img.shields.io/pypi/v/imgtool.svg)][pypi]
 [![Coverity Scan Build Status](https://scan.coverity.com/projects/12307/badge.svg)][coverity]
-[![Build/Test](https://img.shields.io/travis/mcu-tools/mcuboot/master.svg?label=travis-ci)][travis]
+[![Build Status (Sim)](https://github.com/mcu-tools/mcuboot/workflows/Sim/badge.svg)][sim]
+[![Build Status (Mynewt)](https://github.com/mcu-tools/mcuboot/workflows/Mynewt/badge.svg)][mynewt]
+[![Publishing Status (imgtool)](https://github.com/mcu-tools/mcuboot/workflows/imgtool/badge.svg)][imgtool]
+[![Build Status (Travis CI)](https://img.shields.io/travis/mcu-tools/mcuboot/master.svg?label=travis-ci)][travis]
+[![Apache 2.0](https://img.shields.io/badge/License-Apache%202.0-blue.svg)][license]
 
+[pypi]: https://pypi.org/project/imgtool/
 [coverity]: https://scan.coverity.com/projects/mcuboot
+[sim]: https://github.com/mcu-tools/mcuboot/actions?query=workflow:.github/workflows/sim.yaml
+[mynewt]: https://github.com/mcu-tools/mcuboot/actions?query=workflow:.github/workflows/mynewt.yaml
+[imgtool]: https://github.com/mcu-tools/mcuboot/actions?query=workflow:.github/workflows/imgtool.yaml
 [travis]: https://travis-ci.org/mcu-tools/mcuboot
+[license]: https://github.com/mcu-tools/mcuboot/blob/master/LICENSE
 
 This is mcuboot version 1.7.0-rc2