ci: add gitea build workflow and rename export workflow to scheduled with cron trigger

.gitea/workflows/build.yaml

@@ -0,0 +1,23 @@
+name: dR export statistics build
+run-name: dR export statistics build
+on: [push]
+
+jobs:
+  Build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: List files in the repository
+        run: |
+          ls ${{ gitea.workspace }}
+      - run: echo "Install dependencies."
+      - run: apt update
+      - run: apt install python3 python3-pip python3-venv make -y
+      - run: make
+      - run: echo "This job's status is ${{ job.status }}."
+      - run: git add .
+      - run: git config --global user.email "bot@molodetz.com"
+      - run: git config --global user.name "bot"
+      - run: git commit -a -m "Update export statistics"
+      - run: git push

.gitea/workflows/export.yaml

@@ -1,12 +1,11 @@
-name: dR export statistics
-run-name: dR export statistics
+name: dR export statistics scheduled
+run-name: dR export statistics scheduled
 on: 
-  [push]
   schedule:
     - cron: '*/30 * * * *'
 
 jobs:
-  Compile:
+  Export:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository code