build: introduce VERSION file and tag-driven release

- VERSION file at repo root is the source of truth
- main.version is now a var, overridable via -ldflags
- release workflow triggers on tag push and validates tag == VERSION
- manual bump flow: bump VERSION, commit, tag, push

.github/workflows/release.yml

@@ -2,18 +2,12 @@ name: Release
 
 on:
   push:
-    branches:
-      - main
-    paths-ignore:
-      - '.github/workflows/**'
+    tags:
+      - 'v*.*.*'
 
 permissions:
   contents: write
 
-concurrency:
-  group: release
-  cancel-in-progress: false
-
 jobs:
   release:
     runs-on: ubuntu-latest
@@ -23,51 +17,23 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-          token: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Bump version and push tag
-        id: bump
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Verify tag matches VERSION
         run: |
           set -euo pipefail
-          git fetch --tags --force
-
-          if git describe --tags --exact-match HEAD >/dev/null 2>&1; then
-            echo "HEAD is already tagged, skipping bump"
-            exit 0
-          fi
-
-          latest=$(git tag --sort=-v:refname --list 'v*.*.*-alpha' | head -n 1)
-          if [ -z "$latest" ]; then
-            echo "::error::No tag matching vX.Y.Z-alpha pattern found"
+          tag="${GITHUB_REF_NAME#v}"
+          file_version=$(tr -d '[:space:]' < VERSION)
+          if [ "$tag" != "$file_version" ]; then
+            echo "::error::Tag v$tag does not match VERSION file ($file_version)"
+            echo "Bump VERSION first, then tag and push."
             exit 1
           fi
-          echo "Latest tag: $latest"
-
-          version="${latest#v}"
-          version="${version%-alpha}"
-          IFS='.' read -r major minor patch <<< "$version"
-          new_version="${major}.${minor}.$((patch + 1))-alpha"
-          new_tag="v${new_version}"
-
-          if git rev-parse "$new_tag" >/dev/null 2>&1; then
-            echo "::error::Tag $new_tag already exists"
-            exit 1
-          fi
-
-          git config user.name "github-actions[bot]"
-          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
-          git tag -a "$new_tag" -m "Release $new_tag"
-          git push origin "$new_tag"
-
-          echo "tag=$new_tag" >> "$GITHUB_OUTPUT"
+          echo "VERSION=$file_version OK"
 
       - name: Create GitHub release
-        if: steps.bump.outputs.tag
         uses: softprops/action-gh-release@v2
         with:
-          tag_name: ${{ steps.bump.outputs.tag }}
-          name: ${{ steps.bump.outputs.tag }}
+          tag_name: ${{ github.ref_name }}
+          name: ${{ github.ref_name }}
           prerelease: true
           generate_release_notes: true

VERSION

@@ -0,0 +1 @@
+0.1.0-alpha

cmd/chat-bot/main.go

@@ -23,7 +23,10 @@ import (
 	"github.com/VictorVargas/rony-chat-bot/internal/server"
 )
 
-const version = "0.2.0-dev"
+// Override at build time:
+//
+//	go build -ldflags "-X main.version=$(cat VERSION)" -o bin/chat-bot ./cmd/chat-bot
+var version = "dev"
 
 var (
 	cfgFile   string