Remove goreleaser in favor of build scripts (#2143)

scripts/image_tag.sh

@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+
+# This script prints the image tag to use for the given arch and version
+# combination.
+#
+# Usage: ./image_tag.sh [--arch amd64] [--version 1.2.3]
+#
+# The --arch parameter accepts a Golang arch specification. If not specified,
+# the image tag for the multi-arch image will be returned instead.
+#
+# If no version is specified, defaults to the version from ./version.sh. If the
+# supplied version is "latest", no `v` prefix will be added to the tag.
+#
+# The returned tag will be sanitized to remove invalid characters like the plus
+# sign.
+
+set -euo pipefail
+# shellcheck source=scripts/lib.sh
+source "$(dirname "${BASH_SOURCE[0]}")/lib.sh"
+
+arch=""
+version=""
+
+args="$(getopt -o "" -l arch:,version: -- "$@")"
+eval set -- "$args"
+while true; do
+	case "$1" in
+	--arch)
+		arch="$2"
+		shift 2
+		;;
+	--version)
+		version="$2"
+		shift 2
+		;;
+	--)
+		shift
+		break
+		;;
+	*)
+		error "Unrecognized option: $1"
+		;;
+	esac
+done
+
+# Remove the "v" prefix because we don't want to add it twice.
+version="${version#v}"
+if [[ "$version" == "" ]]; then
+	version="$(execrelative ./version.sh)"
+fi
+
+image="${CODER_IMAGE_BASE:-ghcr.io/coder/coder}"
+tag="v$version"
+if [[ "$version" == "latest" ]]; then
+	tag="latest"
+fi
+if [[ "$arch" != "" ]]; then
+	tag+="-$arch"
+fi
+
+# Dev versions contain plus signs which are illegal characters in Docker tags.
+tag="${tag//+/-}"
+echo "$image:$tag"