Allow empty git ref for checkout

Author: Evert

.github/workflows/coverage.yml

@@ -5,11 +5,11 @@ on:
       git_ref:
         type: string
         description: Git ref of the DuckDB python package
-        default: refs/heads/main
-        required: true
+        required: false
       duckdb_git_ref:
         type: string
         description: Git ref of DuckDB
+        required: false
       testsuite:
         type: choice
         description: Testsuite to run ('all' or 'fast')
@@ -23,9 +23,10 @@ on:
       git_ref:
         type: string
         description: Git ref of the DuckDB python package
-        required: true
+        required: false
       duckdb_git_ref:
         type: string
+        required: false
       testsuite:
         type: string
         description: Testsuite to run ('all' or 'fast')

.github/workflows/on_pr.yml

@@ -28,14 +28,12 @@ jobs:
     with:
       minimal: true
       testsuite: all
-      git_ref: ${{ github.head_ref }}
       duckdb_git_ref: ${{ github.base_ref }}
 
   coverage_test:
     name: Run coverage tests
     if: ${{ github.event_name != 'pull_request' || github.event.pull_request.draft == false }}
     uses: ./.github/workflows/coverage.yml
     with:
-      git_ref: ${{ github.head_ref }}
       duckdb_git_ref: ${{ github.base_ref }}
       testsuite: all

.github/workflows/pypi_packaging.yml

@@ -19,8 +19,7 @@ on:
       git_ref:
         type: string
         description: Git ref of the DuckDB python package
-        required: true
-        default: refs/heads/main
+        required: false
       duckdb_git_ref:
         type: string
         description: Git ref of DuckDB
@@ -44,11 +43,11 @@ on:
       git_ref:
         type: string
         description: Git ref of the DuckDB python package
-        required: true
+        required: false
       duckdb_git_ref:
         type: string
         description: Git ref of DuckDB
-        required: true
+        required: false
       force_version:
         description: Force version (vX.Y.Z-((rc|post)N))
         required: false