delete the GitHub-hosted workflows the native gate replaces

main.yml (lint, generate-check, build+test), go-cross.yml (ubuntu/macos/windows
matrix) and release.yml (goreleaser) all ran on GitHub's machines. main.yml was
also half dead: it triggers on a push to master and this repo's branch is main,
so only its pull_request half ever fired. The suite now runs in hanzo.yml on
the git.hanzo.ai fleet.

.github/workflows/go-cross.yml

@@ -1,55 +0,0 @@
-name: Build Cross OS
-
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-
-jobs:
-
-  cross:
-    name: Go
-    runs-on: ${{ matrix.os }}
-    defaults:
-      run:
-        working-directory: ${{ github.workspace }}/go/src/github.com/hanzoai/yaegi
-
-    strategy:
-      matrix:
-        go-version: [ oldstable, stable ]
-        os: [ubuntu-latest, macos-latest, windows-latest]
-
-        include:
-          - os: ubuntu-latest
-            go-path-suffix: /go
-          - os: macos-latest
-            go-path-suffix: /go
-          - os: windows-latest
-            go-path-suffix: \go
-
-    steps:
-      # https://github.com/marketplace/actions/checkout
-      - name: Checkout code
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
-        with:
-          path: go/src/github.com/hanzoai/yaegi
-
-      # https://github.com/marketplace/actions/setup-go-environment
-      - name: Set up Go ${{ matrix.go-version }}
-        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0
-        with:
-          go-version: ${{ matrix.go-version }}
-          stable: true
-
-      - name: Setup GOPATH
-        run: go env -w GOPATH=${{ github.workspace }}${{ matrix.go-path-suffix }}
-
-# TODO fail on windows
-#      - name: Tests
-#        run: go test -v -cover ./...
-#        env:
-#          GOPATH: ${{ github.workspace }}${{ matrix.go-path }}
-
-      - name: Build
-        run: go build -race -v -ldflags "-s -w" -trimpath