Server Build Trigger (!273)

This is a workflow that triggers the build workflow of the Build project whenever this project has a tag pushed to it.

Reviewed-on: https://dev.sp-tarkov.com/SPT-AKI/Server/pulls/273

.gitea/workflows/build-trigger.yaml

@@ -0,0 +1,35 @@
+name: Trigger Main Build Pipeline
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  trigger-main-build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Setup Git Config
+      run: |
+        git config --global user.email "triggerbot@example.com"
+        git config --global user.name "TriggerBot"
+
+    - name: Clone Build Repository
+      run: |
+        rm -rf ../Build
+        git clone https://${{ secrets.BUILD_USERNAME }}:${{ secrets.BUILD_ACCESS_TOKEN }}@dev.sp-tarkov.com/SPT-AKI/Build.git ../Build
+
+    - name: Trigger Branch
+      working-directory: ../Build
+      run: git checkout -b trigger || git checkout trigger
+
+    - name: Create Trigger File
+      working-directory: ../Build
+      run: |
+        echo "${GITHUB_REF_NAME}" > .gitea/trigger
+        git add .gitea/trigger
+        git commit -m "Server triggered build with tag '${GITHUB_REF_NAME}'"
+
+    - name: Force Push
+      working-directory: ../Build
+      run: git push --force origin trigger