chore: update CircleCI configuration to build and test packages with 'since master' flag and add smart-contracts build step

Author: rodrigopavezi

.circleci/config.yml

@@ -78,7 +78,7 @@ jobs:
             - ~/.cache/yarn
       - run:
           name: Build all packages with lerna
-          command: 'yarn build --skip-nx-cache'
+          command: 'yarn build --since master'
       - persist_to_workspace:
           root: *working_directory
           paths:
@@ -108,6 +108,7 @@ jobs:
           name: 'Test unit'
           command: |
             yarn test \
+            --since master \
             --ignore @requestnetwork/request-client.js \
             --ignore @requestnetwork/smart-contracts \
             --ignore @requestnetwork/payment-detection \
@@ -156,6 +157,9 @@ jobs:
     steps:
       - attach_workspace:
           at: *working_directory
+      - run:
+          name: 'Build smart-contracts'
+          command: 'yarn build --scope @requestnetwork/smart-contracts'
       - run:
           name: 'Deploy test contract from smart-contracts'
           command: 'yarn deploy:contracts'
@@ -164,6 +168,7 @@ jobs:
           name: 'Test request-client.js, smart-contracts, payment-detection and payment-processor'
           command: |
             yarn test \
+              --since master \
               --scope @requestnetwork/request-client.js \
               --scope @requestnetwork/smart-contracts \
               --scope @requestnetwork/payment-detection \
@@ -188,6 +193,9 @@ jobs:
     steps:
       - attach_workspace:
           at: *working_directory
+      - run:
+          name: 'Build smart-contracts'
+          command: 'yarn build --scope @requestnetwork/smart-contracts'
       - run:
           name: 'Deploy test contract from smart-contracts'
           command: 'yarn deploy:contracts'
@@ -201,6 +209,7 @@ jobs:
           name: 'Test integration-test'
           command: |
             yarn test \
+              --since master \
               --scope @requestnetwork/integration-test
       - store_test_results:
           path: packages/integration-test/reports/
@@ -271,6 +280,9 @@ jobs:
       - run:
           name: 'Authenticate with registry'
           command: echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" > ~/repo/.npmrc
+      - run:
+          name: 'Build all packages with lerna'
+          command: 'yarn build --skip-nx-cache'
       - run:
           name: 'Publish'
           command: |