ci: add performance test reporting for sysbench

Since analyzing the performance test results via the workflow artifacts
is quite inconvenient (we need to download the artifact, unpack it, look
through results), we need a more human approach to see the test report.
Moreover, it would be cool to see the performance difference between the
commits.

So this patch adds reporting the performance test results to MyTeam chat
and mailing list. Furthermore, the comparison of test results is added
to the report. Seeing the test report in the chat or mail is very simple
and convenient, plus forever results history as a bonus.

The test report looks something like this:

    # Curr:
    #   branch:  add-feature-y
    #   build:   1.2.3-42-g6c71c3901
    #   summary: Add feature Y
    #   machine: x86_64
    #   distrib: ce
    #   gc64:    false
    # Prev:
    #   branch:  add-feature-x
    #   build:   1.2.3-41-g5271240ea
    #   summary: Add feature X
    #   machine: x86_64
    #   distrib: ce
    #   gc64:    false
    +----------------------+----------+----------+----------+
    |Sysbench              | Curr(rps)| Prev(rps)|     Ratio|
    +----------------------+----------+----------+----------+
    |oltp_delete           | 11408.000| 11532.000|     0.989|
    |oltp_insert           | 31455.000| 31322.000|     1.004|
    |oltp_point_select     | 65031.000| 66486.000|     0.978|
    |oltp_read_only        |  1732.000|  1735.000|     0.998|
    |oltp_read_write       |  1211.000|  1196.000|     1.013|
    |oltp_update_index     | 15580.000| 15570.000|     1.001|
    |oltp_update_non_index | 16129.000| 16093.000|     1.002|
    |oltp_write_only       |  4482.000|  4434.000|     1.011|
    |select_random_points  | 18525.000| 18517.000|     1.000|
    |select_random_ranges  |  4364.000|  4331.000|     1.008|
    +----------------------+----------+----------+----------+
    |gmean                 |  9223.593|  9220.182|     1.000|
    +----------------------+----------+----------+----------+

NO_DOC=ci
NO_TEST=ci
NO_CHANGELOG=ci

.github/workflows/perf_sysbench.yml

@@ -53,6 +53,10 @@ jobs:
       - name: Add tarantool path to $PATH
         run: echo "${PWD}/src:${PWD}/extra/dist" >> ${GITHUB_PATH}
 
+      - name: Get tarantool version
+        id: tarantool-version
+        run: echo "::set-output name=value::$(tarantool -e 'print(_TARANTOOL)')"
+
       - name: Build and install sysbench
         run: |
           ./autogen.sh
@@ -71,13 +75,57 @@ jobs:
         run: python3 -m pip install --user --requirement requirements.txt
         working-directory: ./bench-run/publishing
 
-      - name: Publish metrics
+      - name: Publish metrics to database
         env:
           INFLUXDB_ORG: tarantool
           INFLUXDB_BUCKET: perf
           INFLUXDB_URL: ${{ secrets.INFLUXDB_URL }}
           INFLUXDB_TOKEN: ${{ secrets.INFLUXDB_TOKEN }}
-        run: ./bench-run/publishing/influxdb.py -m sysbench -f Sysbench_result.txt
+        run: |
+          ./bench-run/publishing/influxdb.py \
+            --measurement sysbench \
+            --file Sysbench_result.txt \
+            --save sysbench_db_record.txt \
+            --prev
+
+      - name: Install requirements for metrics reporter
+        run: python3 -m pip install --user --requirement requirements.txt
+        working-directory: ./bench-run/reporting
+
+      - name: Generate metrics report
+        run: |
+          ./bench-run/reporting/table.py \
+            --input sysbench_db_record.txt \
+            --output sysbench_result_table.txt
+
+      - name: Send metrics report to MyTeam chat
+        env:
+          MYTEAM_URL: ${{ secrets.MYTEAM_URL }}
+          MYTEAM_TOKEN: ${{ secrets.MYTEAM_TOKEN }}
+          MYTEAM_CHAT_ID: ${{ secrets.MYTEAM_CHAT_ID }}
+        run: |
+          ./bench-run/reporting/myteam.py \
+            --message-file sysbench_result_table.txt \
+            --format MarkdownV2
+
+      - name: Prepare email body
+        run: |
+          { echo '<pre>'; cat sysbench_result_table.txt; echo '<pre/>'; } \
+            > sysbench_result_table.html
+
+      - name: Send metrics report to mailing list
+        uses: dawidd6/action-send-mail@v3
+        with:
+          server_address: ${{ secrets.PERF_EMAIL_SERVER }}
+          server_port: 25
+          subject: >
+            Tarantool Perf Testing. Branch: ${{ github.ref_name }}.
+            Build: ${{ steps.tarantool-version.outputs.value }}.
+            Test: sysbench
+          to: ${{ secrets.PERF_EMAIL_RECIPIENTS }}
+          from: ${{ secrets.PERF_EMAIL_SENDER }}
+          html_body: file://sysbench_result_table.html
+          ignore_cert: false
 
       - name: call action to send Telegram message on failure
         env: