Adapt to new Grabl syntax (#98)

## What is the goal of this PR?

Grabl recently changed the `automation.yml` syntax to have `image` instead of `machine`

## What are the changes implemented in this PR?

Replace all `machine:` usages with `image:`

Author: vmax

.grabl/automation.yml

@@ -26,19 +26,19 @@ build:
       owner: graknlabs
       branch: master
     dependency-analysis:
-      machine: graknlabs-ubuntu-20.04-java11
+      image: graknlabs-ubuntu-20.04-java11
       script: |
         bazel run @graknlabs_dependencies//grabl/analysis:dependency-analysis
   correctness:
     build:
-      machine: graknlabs-ubuntu-20.04
+      image: graknlabs-ubuntu-20.04
       #NPM packages can't be built under RBE
       script: |
         bazel build //...
         bazel run @graknlabs_dependencies//tool/checkstyle:test-coverage
         bazel test $(bazel query 'kind(checkstyle_test, //...)')
     build-dependency:
-      machine: graknlabs-ubuntu-20.04
+      image: graknlabs-ubuntu-20.04
       script: |
         dependencies/maven/update.sh
         git diff --exit-code dependencies/maven/artifacts.snapshot
@@ -47,7 +47,7 @@ build:
       filter:
         owner: graknlabs
         branch: master
-      machine: graknlabs-ubuntu-20.04
+      image: graknlabs-ubuntu-20.04
       dependencies: [build, build-dependency]
       script: |
         export DEPLOY_MAVEN_USERNAME=$REPO_GRAKN_USERNAME
@@ -57,7 +57,7 @@ build:
       filter:
         owner: graknlabs
         branch: master
-      machine: graknlabs-ubuntu-20.04
+      image: graknlabs-ubuntu-20.04
       script: |
         curl https://cli-assets.heroku.com/apt/release.key | sudo apt-key add -
         wget -q -O - https://dl.google.com/linux/linux_signing_key.pub | sudo apt-key add -
@@ -72,7 +72,7 @@ build:
       filter:
         owner: graknlabs
         branch: master
-      machine: graknlabs-ubuntu-20.04
+      image: graknlabs-ubuntu-20.04
       type: foreground
       script: |
         pyenv global 3.6.10
@@ -89,22 +89,22 @@ release:
     branch: master
   deployment:
     deploy-github:
-      machine: graknlabs-ubuntu-20.04
+      image: graknlabs-ubuntu-20.04
       script: |
         pip install certifi
         export RELEASE_NOTES_TOKEN=$REPO_GITHUB_TOKEN
         bazel run @graknlabs_dependencies//tool/release:create-notes -- protocol $(cat VERSION) ./RELEASE_TEMPLATE.md
         export DEPLOY_GITHUB_TOKEN=$REPO_GITHUB_TOKEN
         bazel run --define version=$(cat VERSION) //:deploy-github -- $GRABL_COMMIT
     deploy-maven-release:
-      machine: graknlabs-ubuntu-20.04
+      image: graknlabs-ubuntu-20.04
       script: |
         export DEPLOY_MAVEN_USERNAME=$REPO_GRAKN_USERNAME
         export DEPLOY_MAVEN_PASSWORD=$REPO_GRAKN_PASSWORD
         bazel run --define version=$(cat VERSION) //grpc/java:deploy-maven -- release
       dependencies: [deploy-github]
     deploy-npm-release:
-      machine: graknlabs-ubuntu-20.04
+      image: graknlabs-ubuntu-20.04
       script: |
         curl https://cli-assets.heroku.com/apt/release.key | sudo apt-key add -
         wget -q -O - https://dl.google.com/linux/linux_signing_key.pub | sudo apt-key add -
@@ -116,7 +116,7 @@ release:
         bazel run --define version=$(cat VERSION) //grpc/nodejs:deploy-npm -- release
       dependencies: [deploy-github]
     deploy-pip-release:
-      machine: graknlabs-ubuntu-20.04
+      image: graknlabs-ubuntu-20.04
       script: |
         pyenv global 3.6.10
         sudo unlink /usr/bin/python3