Revert "chore/fix: switch release pipeline to goreleaser & ghcr.io (#40)" (#42)

This reverts commit b56a421ef2.

.goreleaser.yaml

@@ -1,35 +0,0 @@
-project_name: docsonnet
-before:
-  hooks:
-    - go mod tidy
-builds:
-  - binary: docsonnet
-    env:
-      - CGO_ENABLED=0
-    goos:
-      - linux
-      - darwin
-    goarch:
-      - amd64
-      - arm64
-checksum:
-  name_template: 'checksums.txt'
-dockers:
-- image_templates:
-  - "ghcr.io/jsonnet-libs/docsonnet:{{ .Version }}-amd64"
-  use: buildx
-  dockerfile: Dockerfile
-  build_flag_templates:
-  - "--platform=linux/amd64"
-- image_templates:
-  - "ghcr.io/jsonnet-libs/docsonnet:{{ .Version }}-arm64v8"
-  use: buildx
-  goarch: arm64
-  dockerfile: Dockerfile
-  build_flag_templates:
-  - "--platform=linux/arm64/v8"
-docker_manifests:
-- name_template: ghcr.io/jsonnet-libs/docsonnet:{{ .Version }}
-  image_templates:
-  - ghcr.io/jsonnet-libs/docsonnet:{{ .Version }}-amd64
-  - ghcr.io/jsonnet-libs/docsonnet:{{ .Version }}-arm64v8