ci: remove github workflows

Build and test on MRs but remove all other
workflows in favor of tangled

.github/workflows/go.yaml

···
 name: go
 on:
-  push:
-    branches:
-      - main
   pull_request:
     branches:
       - main

.github/workflows/golangci-lint.yaml

···
-name: golangci-lint
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-
-permissions:
-  contents: read
-
-jobs:
-  golangci:
-    name: lint
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v5
-      - uses: actions/setup-go@v6
-        with:
-          go-version: "1.24"
-      - name: golangci-lint
-        uses: golangci/golangci-lint-action@v8

.github/workflows/goreleaser.yaml

···
-name: goreleaser
-on:
-  push:
-    tags:
-      - "*"
-
-permissions:
-  contents: write
-
-jobs:
-  goreleaser:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v5
-      - uses: actions/setup-go@v6
-      - name: run goreleaser
-        uses: goreleaser/goreleaser-action@v6
-        with:
-          args: release --clean