Add CI job for mips64el

Note that our CI server is not ready for mips64el yet, so the binaries
of libcc are not available yet. Currently it is downloading the binaries
created by me manually, we should redirect to the official mirror before
merging this PR.

.circleci/config.yml

@@ -172,6 +172,64 @@ jobs:
              else
                 echo 'Skipping upload distribution because build is not for release'
              fi
+  electron-linux-mips64el:
+    docker:
+      - image: electronbuilds/electron:0.0.3
+        environment:
+          TARGET_ARCH: mips64el
+          LIBCHROMIUMCONTENT_MIRROR: https://s3.amazonaws.com/gh-contractor-zcbenz/libchromiumcontent
+    resource_class: xlarge
+    steps:
+      - checkout
+      - run:
+          name: Check for release
+          command: |
+            if [ -n "${RUN_RELEASE_BUILD}" ]; then
+              echo 'release build triggered from api'
+              echo 'export ELECTRON_RELEASE=1 TRIGGERED_BY_API=1' >> $BASH_ENV
+            fi
+      - run:
+         name: Bootstrap
+         command: |
+           if [ "$ELECTRON_RELEASE" == "1" ]; then
+              echo 'Bootstrapping Electron for release build'
+              script/bootstrap.py --target_arch=$TARGET_ARCH
+           else
+              echo 'Bootstrapping Electron for debug build'
+              script/bootstrap.py --target_arch=$TARGET_ARCH --dev
+           fi
+      - run: npm run lint
+      - run:
+         name: Build
+         command: |
+           if [ "$ELECTRON_RELEASE" == "1" ]; then
+              echo 'Building Electron for release'
+              script/build.py -c R
+           else
+              echo 'Building Electron for debug'
+              script/build.py -c D
+           fi
+      - run:
+          name: Create distribution
+          command: |
+             if [ "$ELECTRON_RELEASE" == "1" ]; then
+                echo 'Creating Electron release distribution'
+                script/create-dist.py
+             else
+                echo 'Skipping create distribution because build is not for release'
+             fi
+      - run:
+          name: Upload distribution
+          command: |
+             if [ "$ELECTRON_RELEASE" == "1" ] && [ "$TRIGGERED_BY_API" != "1" ]; then
+                echo 'Uploading Electron release distribution to github releases'
+                script/upload.py
+             elif [ "$ELECTRON_RELEASE" == "1" ] && [ "$TRIGGERED_BY_API" == "1" ]; then
+                echo 'Uploading Electron release distribution to s3'
+                script/upload.py --upload_to_s3
+             else
+                echo 'Skipping upload distribution because build is not for release'
+             fi
 
   electron-linux-x64:
     docker: