build: use goreleaser build with manual archive creation

goreleaser v2 has a bug with no_unique_dist_dir where it registers
archive tasks for all sub-arch variants even when constraints limit
builds to one per arch, causing archive collision errors. Switch dist
target to use goreleaser build (binaries only) and create tar.gz/zip
archives manually, copying LICENSE and README.md into each platform
directory to match the existing archive structure.

Add sub-arch constraints (goamd64, goarm64, go386, goriscv64) to ensure
only one variant is built per architecture.

Signed-off-by: Terry Howe <terrylhowe@gmail.com>

.goreleaser.yaml

@@ -19,8 +19,16 @@ builds:
       - s390x
       - riscv64
       - loong64
+    goamd64:
+      - v1
     goarm:
       - "7"
+    goarm64:
+      - v8.0
+    go386:
+      - sse2
+    goriscv64:
+      - rva20u64
     ignore:
       - goos: darwin
         goarch: "386"
@@ -55,28 +63,6 @@ builds:
       - -trimpath
     dir: .
 
-archives:
-  - id: default
-    # this name template makes the OS and Arch compatible with the results of uname.
-    name_template: >-
-      {{- .ProjectName }}-
-      {{- .Version }}-
-      {{- .Os }}-
-      {{- .Arch }}
-    formats:
-      - tar.gz
-    format_overrides:
-      - goos: windows
-        formats:
-          - tar.gz
-          - zip
-    files:
-      - LICENSE
-      - README.md
-
-checksum:
-  disable: true
-
 snapshot:
   version_template: "{{ if index .Env \"GORELEASER_CURRENT_TAG\" }}{{ .Env.GORELEASER_CURRENT_TAG }}{{ else }}{{ incpatch .Version }}-next{{ end }}"
 
@@ -85,4 +71,4 @@ changelog:
   filters:
     exclude:
       - '^docs:'
-      - '^test:'
+      - '^test:'

Makefile

@@ -177,7 +177,18 @@ build-cross: $(GORELEASER)
 
 .PHONY: dist
 dist: $(GORELEASER)
-	GORELEASER_CURRENT_TAG='$(VERSION)' LDFLAGS='$(LDFLAGS)' $(GORELEASER) release --snapshot --clean
+	GORELEASER_CURRENT_TAG='$(VERSION)' LDFLAGS='$(LDFLAGS)' $(GORELEASER) build --snapshot --clean
+	@for platform_dir in _dist/*/; do \
+		platform=$$(basename "$$platform_dir"); \
+		{ [ -f "_dist/$$platform/helm" ] || [ -f "_dist/$$platform/helm.exe" ]; } || continue; \
+		cp LICENSE README.md "_dist/$$platform/"; \
+		tar czf "_dist/helm-$(VERSION)-$$platform.tar.gz" -C _dist "$$platform/"; \
+	done
+	@for platform_dir in _dist/windows-*/; do \
+		[ -d "$$platform_dir" ] || continue; \
+		platform=$$(basename "$$platform_dir"); \
+		(cd _dist && zip -r "helm-$(VERSION)-$$platform.zip" "$$platform/"); \
+	done
 
 .PHONY: fetch-dist
 fetch-dist: