Move changelog config to .github, switch to gem

The latest version of the github_changelog_generator gem properly
supports passing the config file path, but the GH action we were
using was quite behind the latest.

So just switch to running the gem directly, using parameter expansion
to retrieve the owner/project as explained in https://www.cazzulino.com/github-actions-repository.html

Author: kzu

.github_changelog_generator renamed to .github/.github_changelog_generator

@@ -1,5 +1,4 @@
 usernames-as-github-logins=true
-header-label=
 issues_wo_labels=true
 pr_wo_labels=true
 exclude-labels=bydesign,dependencies,duplicate,question,invalid,wontfix,need info

.github/workflows/changelog.yml

@@ -25,9 +25,9 @@ jobs:
           token: ${{ env.GH_TOKEN }}
 
       - name: ⚙ changelog
-        uses: faberNovel/github-changelog-generator-action@master
-        with:
-          options: --token ${{ secrets.GITHUB_TOKEN }} --o changelog.md
+        run: |
+          sudo gem install github_changelog_generator 
+          github_changelog_generator --user ${GITHUB_REPOSITORY%/*} --project ${GITHUB_REPOSITORY##*/} --token ${{ secrets.GITHUB_TOKEN }} --o changelog.md --config-file .github/.github_changelog_generator
 
       - name: 🚀 changelog
         run: |

.github/workflows/release-notes.yml

@@ -21,16 +21,16 @@ jobs:
         run: echo "SINCE_TAG=$(git describe --abbrev=0 --tags $(git rev-list --tags --skip=1 --max-count=1))" >> $GITHUB_ENV
 
       - name: ⚙ changelog
-        uses: faberNovel/github-changelog-generator-action@master
         if: env.SINCE_TAG != ''
-        with:
-          options: --token ${{ secrets.GITHUB_TOKEN }} --since-tag ${{ env.SINCE_TAG }} --o changelog.md
+        run: |
+          sudo gem install github_changelog_generator 
+          github_changelog_generator --since-tag ${{ env.SINCE_TAG }} --user ${GITHUB_REPOSITORY%/*} --project ${GITHUB_REPOSITORY##*/} --token ${{ secrets.GITHUB_TOKEN }} --o changelog.md --config-file .github/.github_changelog_generator
 
       - name: ⚙ changelog
-        uses: faberNovel/github-changelog-generator-action@master
         if: env.SINCE_TAG == ''
-        with:
-          options: --token ${{ secrets.GITHUB_TOKEN }} --o changelog.md
+        run: |
+          sudo gem install github_changelog_generator 
+          github_changelog_generator --user ${GITHUB_REPOSITORY%/*} --project ${GITHUB_REPOSITORY##*/} --token ${{ secrets.GITHUB_TOKEN }} --o changelog.md --config-file .github/.github_changelog_generator
 
       - name: 🖉 release
         shell: pwsh