api: add hardcoded versioning support

Added the _VERSION variable to the exported table.
Is part of the task [1].

1. github.com/tarantool/roadmap-internal/issues/204

.github/workflows/push_rockspec.yaml

@@ -11,6 +11,16 @@ env:
   ROCK_NAME: "crud"
 
 jobs:
+  version-check:
+    # We need this job to run only on push with tag.
+    if: ${{ github.event_name == 'push' && startsWith(github.ref, 'refs/tags/') }}
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Check module version
+        uses: tarantool/actions/check-module-version@master
+        with:
+          module-name: 'crud'
+
   push-scm-rockspec:
     runs-on: ubuntu-20.04
     if: github.ref == 'refs/heads/master'
@@ -25,6 +35,7 @@ jobs:
   push-tagged-rockspec:
     runs-on: ubuntu-20.04
     if: startsWith(github.ref, 'refs/tags')
+    needs: version-check
     steps:
       - uses: actions/checkout@master
 

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Added
+* Add versioning support (PR #342).
+
 ### Fixed
 * Pre-hotreload `cartridge` support (older than 2.4.0) (PR #341).
 * Tarantool version-dependent features for 3.x (PR #344).

crud.lua

@@ -23,6 +23,11 @@ local stats = require('crud.stats')
 
 local crud = {}
 
+-- @refer crud.version
+-- @tfield string _VERSION
+--  Module version.
+crud._VERSION = require('crud.version')
+
 --- CRUD operations.
 -- @section crud
 

crud/version.lua

@@ -0,0 +1,4 @@
+-- Сontains the module version.
+-- Requires manual update in case of release commit.
+
+return '1.0.0'