Add timestamp build workflow

.github/workflows/build-timestamped-master.yml

@@ -0,0 +1,43 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '*.md'
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if: github.repository_owner == 'ballerina-platform'
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 17
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'temurin'
+          java-version: 17.0.7
+      - name: Change to Timestamped Version
+        run: |
+          startTime=$(TZ="Asia/Kolkata" date +'%Y%m%d-%H%M00')
+          latestCommit=$(git log -n 1 --pretty=format:"%h")
+          VERSION=$((grep -w 'version' | cut -d= -f2) < gradle.properties | rev | cut --complement -d- -f1 | rev)
+          updatedVersion=$VERSION-$startTime-$latestCommit
+          echo $updatedVersion
+          sed -i "s/version=\(.*\)/version=$updatedVersion/g" gradle.properties
+      - name: Build with Gradle
+        env:
+          packageUser: ${{ secrets.BALLERINA_BOT_USERNAME }}
+          packagePAT: ${{ secrets.BALLERINA_BOT_TOKEN }}
+          publishUser: ${{ secrets.BALLERINA_BOT_USERNAME }}
+          publishPAT: ${{ secrets.BALLERINA_BOT_TOKEN }}
+        run: |
+          ./gradlew publish --scan --no-daemon
+      - name: Upload Artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: ballerina-runtime
+          path: target/ballerina-runtime/
+