added repo bootstrap tool

Makefile

@@ -8,6 +8,7 @@ GOFLAGS := -trimpath -ldflags="-s -w"
 TARGETS := \
 	linux/amd64 \
 	linux/arm64 \
+	linux/arm/6 \
 	darwin/amd64 \
 	darwin/arm64
 
@@ -18,13 +19,22 @@ all: build
 build:
 	go build $(GOFLAGS) -o $(BINARY) $(PKG)
 
-# Cross-compile native binaries for each supported (OS, arch) pair into dist/.
+# Cross-compile native binaries for each supported (OS, arch[, GOARM]) triple
+# into dist/. Targets formatted as "os/arch" produce "$(BINARY)-os-arch";
+# "os/arm/N" produces "$(BINARY)-os-armvN" with GOARM=N.
 build-all: $(DIST)
 	@for t in $(TARGETS); do \
-		os=$${t%/*}; arch=$${t#*/}; \
-		out=$(DIST)/$(BINARY)-$$os-$$arch; \
-		echo "==> $$os/$$arch -> $$out"; \
-		CGO_ENABLED=0 GOOS=$$os GOARCH=$$arch \
+		os=$$(echo $$t | cut -d/ -f1); \
+		arch=$$(echo $$t | cut -d/ -f2); \
+		goarm=$$(echo $$t | cut -s -d/ -f3); \
+		if [ -n "$$goarm" ]; then \
+			suffix=$$arch"v"$$goarm; \
+		else \
+			suffix=$$arch; \
+		fi; \
+		out=$(DIST)/$(BINARY)-$$os-$$suffix; \
+		echo "==> $$os/$$arch$${goarm:+ GOARM=$$goarm} -> $$out"; \
+		CGO_ENABLED=0 GOOS=$$os GOARCH=$$arch GOARM=$$goarm \
 			go build $(GOFLAGS) -o $$out $(PKG) || exit 1; \
 	done