Use automatic variable for build target file names

Makefile

@@ -46,55 +46,55 @@ miniflux:
 	@ go build -buildmode=pie -ldflags=$(LD_FLAGS) -o $(APP) main.go
 
 linux-amd64:
-	@ GOOS=linux GOARCH=amd64 go build -ldflags=$(LD_FLAGS) -o $(APP)-linux-amd64 main.go
+	@ GOOS=linux GOARCH=amd64 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 linux-arm64:
-	@ GOOS=linux GOARCH=arm64 go build -ldflags=$(LD_FLAGS) -o $(APP)-linux-arm64 main.go
+	@ GOOS=linux GOARCH=arm64 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 linux-armv7:
-	@ GOOS=linux GOARCH=arm GOARM=7 go build -ldflags=$(LD_FLAGS) -o $(APP)-linux-armv7 main.go
+	@ GOOS=linux GOARCH=arm GOARM=7 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 linux-armv6:
-	@ GOOS=linux GOARCH=arm GOARM=6 go build -ldflags=$(LD_FLAGS) -o $(APP)-linux-armv6 main.go
+	@ GOOS=linux GOARCH=arm GOARM=6 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 linux-armv5:
-	@ GOOS=linux GOARCH=arm GOARM=5 go build -ldflags=$(LD_FLAGS) -o $(APP)-linux-armv5 main.go
+	@ GOOS=linux GOARCH=arm GOARM=5 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 darwin-amd64:
-	@ GOOS=darwin GOARCH=amd64 go build -ldflags=$(LD_FLAGS) -o $(APP)-darwin-amd64 main.go
+	@ GOOS=darwin GOARCH=amd64 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 darwin-arm64:
-	@ GOOS=darwin GOARCH=arm64 go build -ldflags=$(LD_FLAGS) -o $(APP)-darwin-arm64 main.go
+	@ GOOS=darwin GOARCH=arm64 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 freebsd-amd64:
-	@ GOOS=freebsd GOARCH=amd64 go build -ldflags=$(LD_FLAGS) -o $(APP)-freebsd-amd64 main.go
+	@ GOOS=freebsd GOARCH=amd64 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 openbsd-amd64:
-	@ GOOS=openbsd GOARCH=amd64 go build -ldflags=$(LD_FLAGS) -o $(APP)-openbsd-amd64 main.go
+	@ GOOS=openbsd GOARCH=amd64 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 windows-amd64:
-	@ GOOS=windows GOARCH=amd64 go build -ldflags=$(LD_FLAGS) -o $(APP)-windows-amd64 main.go
+	@ GOOS=windows GOARCH=amd64 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 build: linux-amd64 linux-arm64 linux-armv7 linux-armv6 linux-armv5 darwin-amd64 darwin-arm64 freebsd-amd64 openbsd-amd64 windows-amd64
 
 # NOTE: unsupported targets
 netbsd-amd64:
-	@ GOOS=netbsd GOARCH=amd64 go build -ldflags=$(LD_FLAGS) -o $(APP)-netbsd-amd64 main.go
+	@ GOOS=netbsd GOARCH=amd64 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 linux-x86:
-	@ GOOS=linux GOARCH=386 go build -ldflags=$(LD_FLAGS) -o $(APP)-linux-x86 main.go
+	@ GOOS=linux GOARCH=386 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 freebsd-x86:
-	@ GOOS=freebsd GOARCH=386 go build -ldflags=$(LD_FLAGS) -o $(APP)-freebsd-x86 main.go
+	@ GOOS=freebsd GOARCH=386 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 netbsd-x86:
-	@ GOOS=netbsd GOARCH=386 go build -ldflags=$(LD_FLAGS) -o $(APP)-netbsd-x86 main.go
+	@ GOOS=netbsd GOARCH=386 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 openbsd-x86:
-	@ GOOS=openbsd GOARCH=386 go build -ldflags=$(LD_FLAGS) -o $(APP)-freebsd-x86 main.go
+	@ GOOS=openbsd GOARCH=386 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 windows-x86:
-	@ GOOS=windows GOARCH=386 go build -ldflags=$(LD_FLAGS) -o $(APP)-windows-x86 main.go
+	@ GOOS=windows GOARCH=386 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
 
 run:
 	@ LOG_DATE_TIME=1 DEBUG=1 RUN_MIGRATIONS=1 go run main.go