tweaks: only on master, or PR to master; remove ad; fix path

.github/workflows/changelog_generator.yml

@@ -3,9 +3,9 @@ name: GitHub_Changelog_Generator
 
 on:
     push:
-      branches: ["**"]
+      branches: ["master"]
     pull_request:
-      branches: ["**"]
+      branches: ["master"]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.number }}-${{ github.event.ref }}
@@ -51,6 +51,9 @@ jobs:
         - name: Append changelog from pre-GitHub times
           run: |
             cat ${{ github.workspace }}/src/pregh-changes.md >> ~/changelog_build/CHANGES.md
+        - name: Remove the inserted advert from the file
+          run: |
+            sed -i '/This Changelog was automatically generated by/d' ~/changelog_build/CHANGES.md
         - name: Print out complete changelog
           run: |
             cat ~/changelog_build/CHANGES.md
@@ -70,6 +73,7 @@ jobs:
           uses: actions/download-artifact@v4
           with:
             name: changelog_pre_lint
+            path: ~/changelog_build/CHANGES.md
         - name: Set up Node
           uses: actions/setup-node@v4
           with:
@@ -106,6 +110,7 @@ jobs:
           uses: actions/download-artifact@v4
           with:
             name: changelog_post_lint
+            path: ~/changelog_build/CHANGES.md
         - name: Changelog deployment
           run: |
             if (git log -1 --pretty=%s | grep Merge*) && (! git log -1 --pretty=%b | grep REL:) ; then