ci: add working semver autotag (#12)

.github/workflows/semver.yml

@@ -0,0 +1,25 @@
+name: Semver
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  set_tag:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+    - name: Run version bump script
+      run: |
+        VERSION=$(./scripts/semver.sh)
+        echo "Project version: $VERSION"
+
+        git config --global user.name "Gornak40[bot]"
+        git config --global user.email "noreply@algolymp.ru"
+
+        MESSAGE=$(git log -1 --pretty=%B)
+        git tag $VERSION -m $MESSAGE
+        git push origin $VERSION

scripts/semver.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/bash
+major=0
+minor=0
+patch=0
+
+commits=$(git log --reverse --pretty=format:"%s")
+
+while read -r commit_msg; do
+    if [[ $commit_msg == major* ]]; then
+        ((major++))
+        minor=0
+        patch=0
+    elif [[ $commit_msg == feat* ]]; then
+        ((minor++))
+        patch=0
+    else
+        ((patch++))
+    fi
+    >&2 echo "[v$major.$minor.$patch] $commit_msg"
+done <<< $commits
+
+echo "v$major.$minor.$patch"