Drop unneeded version tag argument

Author: henrymercer

.github/workflows/post-release-mergeback.yml

@@ -123,9 +123,8 @@ jobs:
       - name: Prepare partial Changelog
         env:
           PARTIAL_CHANGELOG: "${{ runner.temp }}/partial_changelog.md"
-          VERSION: "${{ steps.getVersion.outputs.version }}"
         run: |
-          python .github/workflows/script/prepare_changelog.py CHANGELOG.md "$VERSION" > $PARTIAL_CHANGELOG
+          python .github/workflows/script/prepare_changelog.py CHANGELOG.md > $PARTIAL_CHANGELOG
 
           echo "::group::Partial CHANGELOG"
           cat $PARTIAL_CHANGELOG

.github/workflows/rollback-release.yml

@@ -127,9 +127,8 @@ jobs:
         env:
           NEW_CHANGELOG: "${{ runner.temp }}/new_changelog.md"
           PARTIAL_CHANGELOG: "${{ runner.temp }}/partial_changelog.md"
-          VERSION: "${{ needs.prepare.outputs.version }}"
         run: |
-          python .github/workflows/script/prepare_changelog.py $NEW_CHANGELOG "$VERSION" > $PARTIAL_CHANGELOG
+          python .github/workflows/script/prepare_changelog.py $NEW_CHANGELOG > $PARTIAL_CHANGELOG
 
           echo "::group::Partial CHANGELOG"
           cat $PARTIAL_CHANGELOG

.github/workflows/script/prepare_changelog.py

@@ -7,7 +7,7 @@
 # Prepare the changelog for the new release
 # This function will extract the part of the changelog that
 # we want to include in the new release.
-def extract_changelog_snippet(changelog_file, version_tag):
+def extract_changelog_snippet(changelog_file):
   output = ''
   if (not os.path.exists(changelog_file)):
     output = EMPTY_CHANGELOG
@@ -29,9 +29,7 @@ def extract_changelog_snippet(changelog_file, version_tag):
   return output.strip()
 
 
-if len(sys.argv) < 3:
-  raise Exception('Expecting argument: changelog_file version_tag')
+if len(sys.argv) < 2:
+  raise Exception('Expecting argument: changelog_file')
 changelog_file = sys.argv[1]
-version_tag = sys.argv[2]
-
-print(extract_changelog_snippet(changelog_file, version_tag))
+print(extract_changelog_snippet(changelog_file))