Or get the branch?

.woodpecker.yml

@@ -7,4 +7,7 @@ pipeline:
       - apt-get update
       - apt-get install -y hunspell hunspell-fr-comprehensive
       - python3 -m pip install -r requirements.txt
+      - BRANCH="$(grep ^BRANCH Makefile | awk '{print $3}')"
+      - git fetch origin --no-tags +refs/heads/$BRANCH
+      - git branch $BRANCH origin/$BRANCH
       - make verifs

Makefile

@@ -140,7 +140,7 @@ wrap: ensure_test_prerequisites
 	@echo "Re wrapping modified files"
 	powrap -m
 
-SRCS = $(shell git diff --name-only $(BRANCH) 2>/dev/null | grep '.po$$' || echo *.po */*.po)
+SRCS = $(shell git diff --name-only $(BRANCH) | grep '.po$$')
 # foo/bar.po => $(POSPELL_TMP_DIR)/foo/bar.po.out
 DESTS = $(addprefix $(POSPELL_TMP_DIR)/,$(addsuffix .out,$(SRCS)))