Migrate files for branch rename from master to main

Update files to support the migration of GrimoireLab repositories
as part of the default branch transition from master to main.

Signed-off-by: Jose Javier Merchante <jjmerchante@bitergia.com>

.github/workflows/changelog.yml

@@ -9,4 +9,4 @@ jobs:
   check-changelog:
     runs-on: ubuntu-latest
     steps:
-      - uses: bitergia/release-tools-check-changelog@master
+      - uses: bitergia/release-tools-check-changelog@main

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Build package using Poetry and store result
-        uses: chaoss/grimoirelab-github-actions/build@master
+        uses: chaoss/grimoirelab-github-actions/build@main
         with:
           artifact-name: cereslib-dist
           artifact-path: dist
@@ -53,7 +53,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Create a new release on the repository
-        uses: chaoss/grimoirelab-github-actions/release@master
+        uses: chaoss/grimoirelab-github-actions/release@main
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
 
@@ -62,7 +62,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Publish the package on PyPI
-        uses: chaoss/grimoirelab-github-actions/publish@master
+        uses: chaoss/grimoirelab-github-actions/publish@main
         with:
           artifact-name: cereslib-dist
           artifact-path: dist

README.md

@@ -1,4 +1,4 @@
-# Ceres [![Build Status](https://github.com/chaoss/grimoirelab-cereslib/workflows/tests/badge.svg)](https://github.com/chaoss/grimoirelab-cereslib/actions?query=workflow:tests+branch:master+event:push) [![Coverage Status](https://coveralls.io/repos/github/chaoss/grimoirelab-cereslib/badge.svg?branch=master)](https://coveralls.io/github/chaoss/grimoirelab-cereslib?branch=master) [![PyPI version](https://badge.fury.io/py/cereslib.svg)](https://badge.fury.io/py/cereslib)
+# Ceres [![Build Status](https://github.com/chaoss/grimoirelab-cereslib/workflows/tests/badge.svg)](https://github.com/chaoss/grimoirelab-cereslib/actions?query=workflow:tests+branch:main+event:push) [![Coverage Status](https://coveralls.io/repos/github/chaoss/grimoirelab-cereslib/badge.svg?branch=main)](https://coveralls.io/github/chaoss/grimoirelab-cereslib?branch=main) [![PyPI version](https://badge.fury.io/py/cereslib.svg)](https://badge.fury.io/py/cereslib)
 
 Ceres is a library that aims at dealing with data in general,
 and software development data in particular.