Drop armv7 build target and remove dead golangci settings

The published multi-arch Docker manifest is amd64+arm64 only, but
GoReleaser and the Makefile dockerx target still built linux/arm/v7
binaries with no matching image. Drop the armv7 target (goarch arm +
goarm 7) from .goreleaser.yml and linux/arm/v7 from the Makefile so
shipped binaries match the images; other platforms are unchanged.

Also remove the goconst and lll settings blocks from
backend/.golangci.yml — neither linter is in the enable list, so the
settings were inert.

.goreleaser.yml

@@ -26,26 +26,17 @@ builds:
       - amd64
       - arm64
       - "386"
-      - arm
-    goarm:
-      - "7"
     ignore:
       - goos: darwin
         goarch: "386"
-      - goos: darwin
-        goarch: arm
       - goos: freebsd
         goarch: arm64
       - goos: freebsd
         goarch: "386"
-      - goos: freebsd
-        goarch: arm
       - goos: windows
         goarch: arm64
       - goos: windows
         goarch: "386"
-      - goos: windows
-        goarch: arm
     ldflags:
       - -s -w -X main.revision={{ .Tag }}-{{ .ShortCommit }}-{{ trimsuffix (replace (replace .CommitDate "-" "") ":" "") "Z" }}
 

Makefile

@@ -17,7 +17,7 @@ docker:
 dockerx:
 	docker buildx build --build-arg GITHUB_REF=$(GITHUB_REF) --build-arg GITHUB_SHA=$(GITHUB_SHA) --build-arg CI=true \
 		--build-arg SKIP_FRONTEND_TEST=true --build-arg SKIP_BACKEND_TEST=true \
-		--progress=plain --platform linux/amd64,linux/arm/v7,linux/arm64 \
+		--progress=plain --platform linux/amd64,linux/arm64 \
 		-t ghcr.io/umputun/remark42:master -t umputun/remark42:master .
 
 release:

backend/.golangci.yml

@@ -20,9 +20,6 @@ linters:
     - unparam
     - unused
   settings:
-    goconst:
-      min-len: 2
-      min-occurrences: 2
     gosec:
       excludes:
         - G117 # false positive: struct field name matches "secret" pattern
@@ -38,8 +35,6 @@ linters:
     govet:
       enable:
         - shadow
-    lll:
-      line-length: 140
     misspell:
       locale: US
   exclusions: