mdbx-ci: migrate to Circle-CI 2.0

Change-Id: Id86af9e033d64a4dc2043db33cd8e7ae173feb22

.circleci/config.yml

@@ -0,0 +1,20 @@
+version: 2
+jobs:
+  build:
+    docker:
+      - image: circleci/buildpack-deps:artful
+    environment:
+      - TESTDB: /tmp/test.db
+      - TESTLOG: /tmp/test.log
+    steps:
+      - checkout
+      - run: make all
+      - run: ulimit -c unlimited && make check
+      - run:
+          command: |
+            mkdir -p /tmp/artifacts
+            mv -t /tmp/artifacts $TESTLOG $TESTDB core.*
+          when: on_fail
+      - store_artifacts:
+          path: /tmp/artifacts
+          destination: test-artifacts

circle.yml

@@ -1,14 +0,0 @@
-machine:
-  timezone:
-    Europe/Moscow
-
-database:
-  override:
-
-compile:
-  override:
-    - make all
-
-test:
-  override:
-    - make check || mv test.log ${CIRCLE_ARTIFACTS}/