WX-906 Sbt Unit Tests as Github Actions

.github/set_up_cromwell_action/action.yml

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+#This is a series of steps that will setup Java/sbt/Cromwell on the local runner.
+#These steps are meant to be re-used and invoked by other Github Action Workflows
+name: 'Set Up Cromwell Steps'
+description: Specific steps that will set up git secrets, java, sbt, and Cromwell on the local machine. 
+inputs:
+  cromwell_repo_token: #As an input to this action, you are required to pass in a token that can be used to authenticate while checking out Cromwell.
+    required: true
+
+runs:
+  using: "composite" # <-- this allows these steps to be used by other workflows.
+  steps:
+      #Allows this github action to use a cache to store stuff like Java and sbt files between runs.
+      - uses: actions/checkout@v3
+        name: Checkout Coursier Cache
+      - uses: coursier/cache-action@v6  
+        name: Enable Coursier Cache
+
+      #Cromwell requires git-secrets be setup. Here, we set up secrets and verify success with a script.
+      - name: Git secrets setup 
+        run: |
+          git clone https://github.com/awslabs/git-secrets.git ~/git-secrets
+          cd ~/git-secrets
+          git checkout ad82d68ee924906a0401dfd48de5057731a9bc84
+          sudo make install
+        shell: bash
+
+      - name: Secrets check
+        run: |
+          sudo ln -s "$(which echo)" /usr/local/bin/say
+          ./minnie-kenny.sh --force
+          git secrets --scan-history
+        shell: bash
+
+      #Clone the cromwell repo to this VM.
+      - name: Clone Cromwell
+        uses: actions/checkout@v3
+        with:
+          repository: broadinstitute/cromwell
+          token: ${{ inputs.cromwell_repo_token }}
+
+      #Install Java to this VM. This Java version and distribution is compatible with Cromwell.
+      - name: Setup JDK
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 11
+          cache: sbt

.github/workflows/cromwell_unit_tests.yml

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+name: 'Cromwell unit tests'
+
+#This github action runs all of Cromwell's unit tests.
+#A matrix strategy is used so that each subproject can be unit tested in parallel with all other subprojects. 
+
+#This is what shows up in the github workflows page as the title. 
+run-name: ${{ github.actor }} running Cromwell sbt unit tests.
+
+#What will trigger the workflow to run. 
+on:
+  workflow_dispatch: #Manual trigger from GitHub UI
+  push:
+  pull_request: 
+
+permissions: 
+  contents: read
+
+jobs:
+  build-and-test: 
+    strategy:
+      fail-fast: false #Disabling fail fast means that even if one job in the matrix fails, the others will still try to complete.
+      matrix: #this array is the output of the command `sbt projects` from the cromwell root directory (minus lots of formatting)
+        sbtSubProject: [awsBackend,
+        awsS3FileSystem,
+        azureBlobFileSystem,
+        backend,
+        centaur,
+        cloud-nio-impl-drs,
+        cloud-nio-impl-ftp,
+        cloud-nio-spi,
+        cloud-nio-util,
+        cloudSupport,
+        common,
+        core,
+        cromiam,
+        cromwell-drs-localizer,
+        cromwellApiClient,
+        databaseMigration,
+        databaseSql,
+        dockerHashing,
+        drsFileSystem,
+        engine,
+        ftpFileSystem,
+        gcsFileSystem,
+        googlePipelinesCommon,
+        googlePipelinesV2Alpha1,
+        googlePipelinesV2Beta,
+        httpFileSystem,
+        languageFactoryCore,
+        perf,
+        server,
+        services,
+        sfsBackend,
+        sraFileSystem,
+        tesBackend,
+        wdlBiscayneLanguageFactory,
+        wdlDraft2LanguageFactory,
+        wdlDraft3LanguageFactory,
+        wdlModelBiscayne,
+        wdlModelDraft2,
+        wdlModelDraft3,
+        wdlNewBaseTransforms,
+        wdlSharedModel,
+        wdlSharedTransforms,
+        wdlTransformsBiscayne,
+        wdlTransformsDraft2,
+        wdlTransformsDraft3,
+        wes2cromwell,
+        wom,
+        womtool]
+
+    #This action is using a Github free runner, rather than a Broad self-hosted one.
+    #This is because the Broad ones don't have sbt installed by default.
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3 # checkout the cromwell repo
+    - uses: ./.github/set_up_cromwell_action #Exectute this reusable github action. It will set up java/sbt/git-secrets/cromwell.
+      with:
+        cromwell_repo_token: ${{ secrets.BROADBOT_GITHUB_TOKEN }}
+
+    #Invoke SBT on a specific subproject, asking it to run all unit tests contained within that subproject.
+    - name: Run tests
+      run: |
+        set -e
+        sbt "${{ matrix.sbtSubProject }}/test"