Disable CGO explicitly to make sure the binary is statically linked

Apparently this behavior has been changed in Go 1.20: https://tip.golang.org/doc/go1.20#cgo

Makefile

@@ -46,19 +46,19 @@ miniflux:
 	@ go build -buildmode=pie -ldflags=$(LD_FLAGS) -o $(APP) main.go
 
 linux-amd64:
-	@ GOOS=linux GOARCH=amd64 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
+	@ CGO_ENABLED=0 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 $(APP)-$@ main.go
+	@ CGO_ENABLED=0 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 $(APP)-$@ main.go
+	@ CGO_ENABLED=0 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 $(APP)-$@ main.go
+	@ CGO_ENABLED=0 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 $(APP)-$@ main.go
+	@ CGO_ENABLED=0 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 $(APP)-$@ main.go
@@ -67,7 +67,7 @@ darwin-arm64:
 	@ 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 $(APP)-$@ main.go
+	@ CGO_ENABLED=0 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 $(APP)-$@ main.go
@@ -79,16 +79,16 @@ build: linux-amd64 linux-arm64 linux-armv7 linux-armv6 linux-armv5 darwin-amd64
 
 # NOTE: unsupported targets
 netbsd-amd64:
-	@ GOOS=netbsd GOARCH=amd64 go build -ldflags=$(LD_FLAGS) -o $(APP)-$@ main.go
+	@ CGO_ENABLED=0 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 $(APP)-$@ main.go
+	@ CGO_ENABLED=0 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 $(APP)-$@ main.go
+	@ CGO_ENABLED=0 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 $(APP)-$@ main.go
+	@ CGO_ENABLED=0 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 $(APP)-$@ main.go