build: parallelize docker image builds

.github/workflows/docker-frontend.yml

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+name: Build and publish frontend docker images to docker hub
+on: 
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: docker/build-push-action@v1
+        with:
+          dockerfile: ./docker/frontend/Dockerfile
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+          repository: linkedin/datahub-frontend
+          tags: latest

.github/workflows/docker-gms.yml

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+name: Build and publish gms docker images to docker hub
+on: 
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: docker/build-push-action@v1
+        with:
+          dockerfile: ./docker/gms/Dockerfile
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+          repository: linkedin/datahub-gms
+          tags: latest

.github/workflows/docker-mae-consumer.yml

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+name: Build and publish mae-consumer docker images to docker hub
+on: 
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: docker/build-push-action@v1
+        with:
+          dockerfile: ./docker/mae-consumer/Dockerfile
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+          repository: linkedin/datahub-mae-consumer
+          tags: latest

.github/workflows/docker-mce-consumer.yml

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+name: Build and publish mce-consumer docker images to docker hub
+on: 
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: docker/build-push-action@v1
+        with:
+          dockerfile: ./docker/mce-consumer/Dockerfile
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+          repository: linkedin/datahub-mce-consumer
+          tags: latest