Adds custom marshal/unmarshal to Go Statement struct, fixes #363, see sigstore/sigstore-go#326 #65

	name: Run Go tests
	on:
	workflow_dispatch:
	push:
	branches:
	- main
	paths:
	- 'go/**'
	# Want to trigger these tests whenever the attestation
	# libraries are regenerated, or new modules/tests are
	# added to the language bindings
	pull_request:
	paths:
	- 'go/**'
	permissions: read-all
	jobs:
	tests:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
	- name: Install Go
	uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32
	with:
	go-version-file: './go.mod'
	- name: Format
	run: if [ "$(gofmt -s -l . \| wc -l)" -gt 0 ]; then exit 1; fi
	- name: Setup Env
	run: \|
	echo "$(go env GOPATH)/bin" >> $GITHUB_PATH
	- name: Run tests
	run: \|
	make go_test

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