ci: overwrite tmpdir in mac integration tests

The test `test_t3_instance_names_no_config` always fails because of very
long path in tmpdir. This test requires socket path with fexed length,
otherwise it can cause socket path buffer overflow.

After the patch tmpdir was overwritten to the shorter one.

Closes #931

.github/workflows/full-ci.yml

@@ -200,7 +200,7 @@ jobs:
         run: mage unitfull
 
       - name: Integration tests
-        run: mage integrationfull
+        run: TMPDIR=/tmp mage integrationfull
 
       # Etcd can be still running after integration tests when:
       # 1. pytest recieve SIGALRM (can be caused by pytest-timeout plugin)

.github/workflows/tests.yml

@@ -191,7 +191,7 @@ jobs:
         run: mage unit
 
       - name: Run integration tests
-        run: mage integration
+        run: TMPDIR=/tmp mage integration
 
       # Etcd can be still running after integration tests when:
       # 1. pytest recieve SIGALRM (can be caused by pytest-timeout plugin)