adding evergreen to repo (#900)

Author: ianf-mongodb

.evergreen/evergreen.yml

@@ -0,0 +1,68 @@
+# Evergreen Project Config
+
+# When a task that used to pass starts to fail
+# Go through all versions that may have been skipped to detect
+# when the task started failing
+stepback: true
+
+# Mark a failure as a system/bootstrap failure (purple box) rather then a task
+# failure by default.
+# Actual testing tasks are marked with `type: test`
+command_type: system
+
+# Protect ourself against rogue test case, or curl gone wild, that runs forever
+# 12 minutes is the longest we'll ever run
+exec_timeout_secs: 3600 # 12 minutes is the longest we'll ever run
+
+# What to do when evergreen hits the timeout (`post:` tasks are run automatically)
+timeout:
+  - command: shell.exec
+    params:
+      script: |
+        ls -la
+functions:
+  "fetch source":
+    - command: git.get_project
+      params:
+        directory: docs-ecosystem
+
+
+  "install checker tool":
+    - command: shell.exec
+      type: system
+      params:
+        shell: bash
+        working_dir: docs-ecosystem
+        script: |
+          export GOPATH=$(dirname $(dirname $(dirname `pwd`)))
+          export GOROOT='/opt/golang/go1.16'
+          export PATH=$GOROOT/bin:$GOPATH/bin/:$PATH
+          go install github.com/terakilobyte/checker@latest
+  "run checker":
+    - command: shell.exec
+      type: test
+      params:
+        shell: bash
+        working_dir: docs-ecosystem
+        script: |
+          export GOPATH=$(dirname $(dirname $(dirname `pwd`)))
+          export GOROOT='/opt/golang/go1.16'
+          export PATH=$GOROOT/bin:$GOPATH/bin/:$PATH
+          git diff --name-only HEAD master | tr "\n" "," | xargs checker --path . --changes
+pre:
+  - func: "fetch source"
+  - func: "install checker tool"
+
+tasks:
+
+  - name: check
+    commands:
+      - func: "run checker"
+
+buildvariants:
+
+  - name: ubuntu2004
+    display_name: Ubuntu 20.04
+    run_on: [ ubuntu2004-large ]
+    tasks:
+      - name: check