chore: Automate version file control and fix goreleaser (#304)

## Summary

Turns `runtime/debug` package allows us to see `BuildInfo` which among
other things has details about the main module's version. The version is
set by `go install`, for prebuilt binaries with `go build` we're leaving
the process intact.
I haven't tested how `go install ...@latest` will behave, until we
release an official new version we won't be able to check that.

I also fixed `goreleaser` config which was ONCE AGAIN misbehaving due to
the recent changes they introduced. It should now not change the
release's metadata, so If you mark it as pre-release or official
version, it will keep it this way.

Author: nieomylnieja

.goreleaser.yml

@@ -30,6 +30,9 @@ checksum:
 
 release:
   make_latest: false
+  draft: true
+  replace_existing_draft: false
+  prerelease: auto
   github:
     owner: nobl9
     name: sloctl

Makefile

@@ -64,6 +64,10 @@ build:
 docker:
 	$(call _build_docker,sloctl,$(VERSION),$(BRANCH),$(REVISION))
 
+.PHONY: test
+## Run all tests.
+test: test/unit test/e2e
+
 .PHONY: test/unit test/go/unit test/bats/%
 ## Run all unit tests.
 test/unit: test/go/unit test/bats/unit

cspell.yaml

@@ -29,6 +29,7 @@ ignorePaths:
   - dist/**
 words:
   - armv
+  - devel
   - distroless
   - dynatrace
   - endef

internal/VERSION

@@ -1,8 +1,8 @@
 package internal
 
 import (
-	_ "embed"
 	"fmt"
+	"runtime/debug"
 	"strings"
 
 	"github.com/spf13/cobra"
@@ -21,12 +21,6 @@ func NewVersionCmd() *cobra.Command {
 	}
 }
 
-// BuildVersion defaults to VERSION file contents.
-// This is necessary since we don't have control over build flags when installed through `go install`.
-//
-//go:embed VERSION
-var embeddedBuildVersion string
-
 // Set during build time.
 var (
 	BuildGitRevision string
@@ -37,7 +31,15 @@ var (
 func getBuildVersion() string {
 	version := BuildVersion
 	if version == "" {
-		version = embeddedBuildVersion
+		version = getRuntimeVersion()
 	}
 	return strings.TrimSpace(version)
 }
+
+func getRuntimeVersion() string {
+	info, ok := debug.ReadBuildInfo()
+	if !ok || info.Main.Version == "(devel)" {
+		return "0.0.0"
+	}
+	return strings.TrimPrefix(info.Main.Version, "v")
+}