feat: support vim.g.oil configuration + remove release-please (#17)

* feat: support vim.g.oil declarative configuration

Problem: oil.nvim requires an imperative require("oil").setup(opts)
call to initialize. The Neovim ecosystem is moving toward vim.g.plugin
as a declarative config source that works without explicit setup calls.

Solution: fall back to vim.g.oil in config.setup() when no opts are
passed, and add plugin/oil.lua to auto-initialize when vim.g.oil is
set. Explicit setup(opts) calls still take precedence. Update docs
and add tests for the new resolution order.

Closes: barrettruth/oil.nvim#1

* build: remove release-please pipeline

Problem: the release-please action creates automated releases that
are not needed for this fork's workflow.

Solution: remove the release job from tests.yml and the
release-please branch exclusion from the review request workflow.

* fix(doc): improve readme phrasing

* doc: minor phrasing "improvements"

* ci: add luarocks release on tag push

Problem: there is no automated way to publish oil.nvim to luarocks
when a new version is tagged.

Solution: add a luarocks workflow that triggers on v* tag pushes,
runs the test suite via workflow_call, then publishes via
luarocks-tag-release. Add workflow_call trigger to tests.yml so it
can be reused.

.github/workflows/automation_request_review.yml

@@ -4,8 +4,6 @@ permissions:
 on:
   pull_request_target:
     types: [opened, reopened, ready_for_review, synchronize]
-    branches-ignore:
-      - "release-please--**"
 
 jobs:
   # Request review automatically when PRs are opened

.github/workflows/luarocks.yaml

@@ -0,0 +1,21 @@
+name: luarocks
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  quality:
+    uses: ./.github/workflows/tests.yml
+
+  publish:
+    needs: quality
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: nvim-neorocks/luarocks-tag-release@v7
+        env:
+          LUAROCKS_API_KEY: ${{ secrets.LUAROCKS_API_KEY }}

.github/workflows/tests.yml

@@ -1,6 +1,7 @@
 name: Tests
 
 on:
+  workflow_call:
   push:
     branches:
       - main
@@ -69,27 +70,3 @@ jobs:
       - name: Run tests
         run: |
           bash ./run_tests.sh
-
-  release:
-    name: release
-
-    if: ${{ github.ref == 'refs/heads/main' }}
-    needs:
-      - luacheck
-      - stylua
-      - typecheck
-      - run_tests
-    runs-on: ubuntu-22.04
-    steps:
-      - uses: googleapis/release-please-action@v4
-        id: release
-        with:
-          release-type: simple
-      - uses: actions/checkout@v4
-      - uses: rickstaa/action-create-tag@v1
-        if: ${{ steps.release.outputs.release_created }}
-        with:
-          tag: stable
-          message: "Current stable release: ${{ steps.release.outputs.tag_name }}"
-          tag_exists_error: false
-          force_push_tag: true