Use buf pinned in Makefile

.github/workflows/ci.yaml

@@ -35,8 +35,4 @@ jobs:
         with:
           go-version-file: tools/go.mod
           cache-dependency-path: go.work.sum
-      - uses: bufbuild/buf-action@v1
-        with:
-          setup_only: true
-      - run: mkdir -p .tmp/bin && cp $(which buf) .tmp/bin/buf
       - run: make checkgenerate

Makefile

@@ -85,19 +85,10 @@ generate-proto: | $(BIN)/buf
 
 .PHONY: generate-license
 generate-license: | $(BIN)/license-header
-	@# We want to operate on a list of modified and new files, excluding
-	@# deleted and ignored files. git-ls-files can't do this alone. comm -23 takes
-	@# two files and prints the union, dropping lines common to both (-3) and
-	@# those only in the second file (-2). We make one git-ls-files call for
-	@# the modified, cached, and new (--others) files, and a second for the
-	@# deleted files.
-	comm -23 \
-		<(git ls-files --cached --modified --others --no-empty-directory --exclude-standard | sort -u | grep -v $(LICENSE_IGNORE) ) \
-		<(git ls-files --deleted | sort -u) | \
-		xargs $(BIN)/license-header \
-			--license-type apache \
-			--copyright-holder "Buf Technologies, Inc." \
-			--year-range "$(COPYRIGHT_YEARS)"
+	$(BIN)/license-header \
+		--license-type apache \
+		--copyright-holder "Buf Technologies, Inc." \
+		--year-range "$(COPYRIGHT_YEARS)"
 
 .PHONY: checkgenerate
 checkgenerate: generate