Allow configuration from env (#15)

cmd/netobserv-ebpf-agent.go

go.mod

go.sum

pkg/agent/agent.go

pkg/agent/agent_test.go

pkg/agent/config.go

pkg/agent/config_test.go

vendor/github.com/caarlos0/env/v6/.gitignore

vendor/github.com/caarlos0/env/v6/.golangci.yml

vendor/github.com/caarlos0/env/v6/.goreleaser.yml

vendor/github.com/caarlos0/env/v6/LICENSE.md

vendor/github.com/caarlos0/env/v6/Makefile

vendor/github.com/caarlos0/env/v6/README.md

vendor/github.com/caarlos0/env/v6/env.go

vendor/github.com/caarlos0/env/v6/env_unix.go

vendor/github.com/caarlos0/env/v6/env_windows.go

vendor/golang.org/x/net/http/httpguts/httplex.go

vendor/golang.org/x/net/http2/Dockerfile

vendor/golang.org/x/net/http2/README

vendor/golang.org/x/net/http2/ascii.go