Restructure project

We previously didn't really had any structure in our project apart
from creating a new folder for each package in our project root.
Now that we have accumulated some packages, we use the well-known
Golang project layout in order to clearly communicate our intent
with packages. See https://github.com/golang-standards/project-layout

internal/runner/manager_mock.go

@@ -0,0 +1,99 @@
+// Code generated by mockery v0.0.0-dev. DO NOT EDIT.
+
+package runner
+
+import (
+	api "github.com/hashicorp/nomad/api"
+	mock "github.com/stretchr/testify/mock"
+)
+
+// ManagerMock is an autogenerated mock type for the Manager type
+type ManagerMock struct {
+	mock.Mock
+}
+
+// Claim provides a mock function with given fields: id, duration
+func (_m *ManagerMock) Claim(id EnvironmentID, duration int) (Runner, error) {
+	ret := _m.Called(id, duration)
+
+	var r0 Runner
+	if rf, ok := ret.Get(0).(func(EnvironmentID, int) Runner); ok {
+		r0 = rf(id, duration)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(Runner)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(EnvironmentID, int) error); ok {
+		r1 = rf(id, duration)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// CreateOrUpdateEnvironment provides a mock function with given fields: id, desiredIdleRunnersCount, templateJob, scale
+func (_m *ManagerMock) CreateOrUpdateEnvironment(id EnvironmentID, desiredIdleRunnersCount uint, templateJob *api.Job, scale bool) (bool, error) {
+	ret := _m.Called(id, desiredIdleRunnersCount, templateJob, scale)
+
+	var r0 bool
+	if rf, ok := ret.Get(0).(func(EnvironmentID, uint, *api.Job, bool) bool); ok {
+		r0 = rf(id, desiredIdleRunnersCount, templateJob, scale)
+	} else {
+		r0 = ret.Get(0).(bool)
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(EnvironmentID, uint, *api.Job, bool) error); ok {
+		r1 = rf(id, desiredIdleRunnersCount, templateJob, scale)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// Get provides a mock function with given fields: runnerID
+func (_m *ManagerMock) Get(runnerID string) (Runner, error) {
+	ret := _m.Called(runnerID)
+
+	var r0 Runner
+	if rf, ok := ret.Get(0).(func(string) Runner); ok {
+		r0 = rf(runnerID)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(Runner)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(string) error); ok {
+		r1 = rf(runnerID)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// Load provides a mock function with given fields:
+func (_m *ManagerMock) Load() {
+	_m.Called()
+}
+
+// Return provides a mock function with given fields: r
+func (_m *ManagerMock) Return(r Runner) error {
+	ret := _m.Called(r)
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(Runner) error); ok {
+		r0 = rf(r)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}