ci: use GitHub Actions token instead of `chatops`/`release_notes` secrets

It seems more secure to use the controlled & limited token than an
ambient secret.

.github/workflows/main.yml

@@ -204,7 +204,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     permissions:
-      contents: read
+      contents: write
 
     needs: [build]
 
@@ -236,7 +236,7 @@ jobs:
 
     - name: Publish GitHub release notes
       env:
-        GH_RELEASE_NOTES_TOKEN: ${{ secrets.release_notes }}
+        GH_RELEASE_NOTES_TOKEN: ${{ github.token }}
       run: |
         sudo apt-get install pandoc
         tox -e publish-gh-release-notes

.github/workflows/prepare-release-pr.yml

@@ -19,7 +19,8 @@ jobs:
   build:
     runs-on: ubuntu-latest
     permissions:
-      contents: read
+      contents: write
+      pull-requests: write
 
     steps:
     - uses: actions/checkout@v2
@@ -40,9 +41,9 @@ jobs:
     - name: Prepare release PR (minor/patch release)
       if: github.event.inputs.major == 'no'
       run: |
-        tox -e prepare-release-pr -- ${{ github.event.inputs.branch }} ${{ secrets.chatops }}
+        tox -e prepare-release-pr -- ${{ github.event.inputs.branch }} ${{ github.token }}
 
     - name: Prepare release PR (major release)
       if: github.event.inputs.major == 'yes'
       run: |
-        tox -e prepare-release-pr -- ${{ github.event.inputs.branch }} ${{ secrets.chatops }} --major
+        tox -e prepare-release-pr -- ${{ github.event.inputs.branch }} ${{ github.token }} --major

.github/workflows/release-on-comment.yml

@@ -14,7 +14,8 @@ jobs:
   build:
     runs-on: ubuntu-latest
     permissions:
-      contents: read
+      contents: write
+      issues: write
 
     if: (github.event.comment && startsWith(github.event.comment.body, '@pytestbot please')) || (github.event.issue && !github.event.comment && startsWith(github.event.issue.body, '@pytestbot please'))
 
@@ -36,4 +37,4 @@ jobs:
 
     - name: Prepare release
       run: |
-        tox -e release-on-comment -- $GITHUB_EVENT_PATH ${{ secrets.chatops }}
+        tox -e release-on-comment -- $GITHUB_EVENT_PATH ${{ github.token }}

scripts/prepare-release-pr.py

@@ -9,9 +9,8 @@ The appropriate version will be obtained based on the given branch automatically
 
 After that, it will create a release using the `release` tox environment, and push a new PR.
 
-**Secret**: currently the secret is defined in the @pytestbot account,
-which the core maintainers have access to. There we created a new secret named `chatops`
-with write access to the repository.
+**Token**: currently the token from the GitHub Actions is used, pushed with
+`pytest bot <pytestbot@gmail.com>` commit author.
 """
 import argparse
 import re

scripts/release-on-comment.py

@@ -23,8 +23,8 @@ Then the appropriate version will be obtained based on the given branch name:
 
 After that, it will create a release using the `release` tox environment, and push a new PR.
 
-**Secret**: currently the secret is defined in the @pytestbot account, which the core maintainers
-have access to. There we created a new secret named `chatops` with write access to the repository.
+**Token**: currently the token from the GitHub Actions is used, pushed with
+`pytest bot <pytestbot@gmail.com>` commit author.
 """
 import argparse
 import json