Delete release.yaml

It hadn't been working for a couple of years already anyway

.github/workflows/release.yaml

@@ -1,28 +0,0 @@
-on:
-  release:
-    types: [created]
-
-jobs:
-  releases-matrix:
-    name: Release Go Binary
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        # build and publish in parallel a lot of binaries
-        # https://golang.org/doc/install/source#environment See supported Go OS/Arch pairs here
-        goos: [linux, darwin, openbsd, windows]
-        goarch: ["386", amd64, arm64]
-        exclude:
-          - goarch: "386"
-            goos: darwin
-          - goarch: arm64
-            goos: windows
-    steps:
-    - uses: actions/checkout@v2
-    - uses: wangyoucao577/go-release-action@v1.17
-      with:
-        github_token: ${{ secrets.GITHUB_TOKEN }}
-        goos: ${{ matrix.goos }}
-        goarch: ${{ matrix.goarch }}
-        binary_name: "mycorrhiza"
-        extra_files: LICENSE README.md help/mycorrhiza.1