Standardize build output directory to build/

Rename builds/ to build/ across Makefile, .gitignore, README, and
example file comments. The build target now outputs all binaries
(tools, commands, examples) to build/ with -o flags.

Author: xaionaro@dx.center

.gitignore

@@ -3,4 +3,4 @@
 *.test
 *.out
 *.prof
-/builds/
+/build/

Makefile

@@ -29,15 +29,16 @@ vet:
 
 # Build all commands, tools, and examples.
 build:
-	go build ./tools/cmd/...
-	go build ./cmd/...
-	@for d in examples/*/; do echo "Building $$d..."; go build "./$$d"; done
+	@mkdir -p build
+	@for d in tools/cmd/*/; do echo "Building $$d..."; go build -o "build/$$(basename $$d)" "./$$d"; done
+	@for d in cmd/*/; do echo "Building $$d..."; go build -o "build/$$(basename $$d)" "./$$d"; done
+	@for d in examples/*/; do echo "Building $$d..."; go build -o "build/$$(basename $$d)" "./$$d"; done
 
 # Build bindercli release binaries for arm64 and amd64.
 release:
-	@mkdir -p builds
-	CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -o builds/bindercli-linux-arm64 ./cmd/bindercli/
-	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o builds/bindercli-linux-amd64 ./cmd/bindercli/
+	@mkdir -p build
+	CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -o build/bindercli-linux-arm64 ./cmd/bindercli/
+	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o build/bindercli-linux-amd64 ./cmd/bindercli/
 
 # Run linter.
 lint:
@@ -57,8 +58,8 @@ genbindercli:
 
 # Build the bindercli tool.
 bindercli:
-	@mkdir -p builds
-	go build -o builds/bindercli ./cmd/bindercli
+	@mkdir -p build
+	go build -o build/bindercli ./cmd/bindercli
 
 # List all available bindercli subcommands.
 list-commands:

README.md

@@ -162,8 +162,8 @@ More examples: [`examples/`](examples/)
 **Install and deploy:**
 
 ```bash
-GOOS=linux GOARCH=arm64 go build -o bindercli ./cmd/bindercli/
-adb push bindercli /data/local/tmp/
+GOOS=linux GOARCH=arm64 go build -o build/bindercli ./cmd/bindercli/
+adb push build/bindercli /data/local/tmp/
 ```
 
 **Try it:**
@@ -189,8 +189,8 @@ See the full [bindercli reference](#bindercli) for all subcommands and more exam
 Binaries are pure Go (no CGO) and run directly on Android:
 
 ```bash
-GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o list_services ./examples/list_services/
-adb push list_services /data/local/tmp/
+GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o build/list_services ./examples/list_services/
+adb push build/list_services /data/local/tmp/
 adb shell /data/local/tmp/list_services
 ```
 
@@ -1206,8 +1206,8 @@ Requires access to `/dev/binder` on the target device (typically available as `s
 Build and deploy:
 
 ```bash
-GOOS=linux GOARCH=arm64 go build -o bindercli ./cmd/bindercli/
-adb push bindercli /data/local/tmp/
+GOOS=linux GOARCH=arm64 go build -o build/bindercli ./cmd/bindercli/
+adb push build/bindercli /data/local/tmp/
 ```
 
 Core subcommands:

examples/activity_manager/main.go

@@ -2,7 +2,7 @@
 //
 // Build:
 //
-//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o activity_manager ./examples/activity_manager/
+//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o build/activity_manager ./examples/activity_manager/
 //	adb push activity_manager /data/local/tmp/ && adb shell /data/local/tmp/activity_manager
 package main
 

examples/audio_status/main.go

@@ -2,7 +2,7 @@
 //
 // Build:
 //
-//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o audio_status ./examples/audio_status/
+//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o build/audio_status ./examples/audio_status/
 //	adb push audio_status /data/local/tmp/ && adb shell /data/local/tmp/audio_status
 package main
 

examples/battery_health/main.go

@@ -2,7 +2,7 @@
 //
 // Build:
 //
-//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o battery_health ./examples/battery_health/
+//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o build/battery_health ./examples/battery_health/
 //	adb push battery_health /data/local/tmp/ && adb shell /data/local/tmp/battery_health
 package main
 

examples/device_info/main.go

@@ -3,7 +3,7 @@
 //
 // Build:
 //
-//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o device_info ./examples/device_info/
+//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o build/device_info ./examples/device_info/
 //	adb push device_info /data/local/tmp/ && adb shell /data/local/tmp/device_info
 package main
 

examples/display_info/main.go

@@ -2,7 +2,7 @@
 //
 // Build:
 //
-//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o display_info ./examples/display_info/
+//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o build/display_info ./examples/display_info/
 //	adb push display_info /data/local/tmp/ && adb shell /data/local/tmp/display_info
 package main
 

examples/list_services/main.go

@@ -2,7 +2,7 @@
 //
 // Build:
 //
-//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o list_services ./examples/list_services/
+//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o build/list_services ./examples/list_services/
 //	adb push list_services /data/local/tmp/ && adb shell /data/local/tmp/list_services
 package main
 

examples/package_query/main.go

@@ -2,7 +2,7 @@
 //
 // Build:
 //
-//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o package_query ./examples/package_query/
+//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o build/package_query ./examples/package_query/
 //	adb push package_query /data/local/tmp/ && adb shell /data/local/tmp/package_query
 package main