ci: fix the GitHub actions repository_dispatch workflow

We switch from using a Go-based GitHub action to using curl directly
because it's significantly quicker.

We also drop the unnecessary requirement on refs having been replicated
to GitHub by fetching from the source directly.

Change-Id: I58487b986aea120ce0e5cd60999103023d4ab389
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/6020
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Marcel van Lohuizen <mpvl@google.com>

.github/workflows/test_dispatch.yml

@@ -1,37 +1,33 @@
-name: Test
-
 on: [repository_dispatch]
-
+name: Test
+env:
+  GERRIT_COOKIE: "${{ secrets.gerritCookie }}"
+defaults:
+  run:
+    shell: bash
 jobs:
   start:
     runs-on: ubuntu-latest
     steps:
-
-    # Go is required for the cue-sh/trybot action
-    - name: Install Go
-      uses: actions/setup-go@v2
-      with:
-        go-version: 1.14.x
+    - name: Write the gitcookies file
+      run: echo "$GERRIT_COOKIE" > ~/.gitcookies
 
     - name: Update Gerrit CL message with starting message
-      uses: cue-sh/trybot@latest
-      with:
-        mode: start
-        runID: ${{ github.run_id }}
-        ref: ${{ github.event.client_payload.ref }}
-        changeID: ${{ github.event.client_payload.changeID }}
-        jobStatus: ${{ job.status }}
-        repo: ${{ github.event.repository.html_url }}
-        gerritCookie: ${{ secrets.gerritCookie }}
+      run: >
+        curl -s -H "Content-Type: application/json" --request POST --data '{"message":"Started the build... see progress at ${{ github.event.repository.html_url }}/actions/runs/${{ github.run_id }}"}' -b ~/.gitcookies https://cue-review.googlesource.com/a/changes/${{ github.event.client_payload.changeID }}/revisions/${{ github.event.client_payload.commit }}/review
 
   test:
     needs: start
     strategy:
+      fail-fast: false
       matrix:
         go-version: [1.13.x, 1.14.x]
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps:
+    - name: Write the gitcookies file
+      run: echo "$GERRIT_COOKIE" > ~/.gitcookies
+
     - name: Install Go
       uses: actions/setup-go@v2
       with:
@@ -40,6 +36,11 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v2
 
+    - name: Checkout ref
+      run: |
+        git fetch https://cue-review.googlesource.com/cue ${{ github.event.client_payload.ref }}
+        git checkout FETCH_HEAD
+
     - name: Cache Go modules
       uses: actions/cache@v1
       with:
@@ -53,38 +54,18 @@ jobs:
     - name: Test with -race
       run: go test -race ./...
 
-    - name: Update Gerrit CL message with failure message
+    - name: Post any failures for this matrix entry
       if: ${{ failure() }}
-      uses: cue-sh/trybot@latest
-      with:
-        mode: end
-        runID: ${{ github.run_id }}
-        ref: ${{ github.event.client_payload.ref }}
-        changeID: ${{ github.event.client_payload.changeID }}
-        jobStatus: "failure"
-        matrixDesc: "${{ runner.os }}-${{ matrix.go-version }}"
-        repo: ${{ github.event.repository.html_url }}
-        gerritCookie: ${{ secrets.gerritCookie }}
+      run: >
+        curl -s -H "Content-Type: application/json" --request POST --data '{"labels": { "Code-Review": -1 }, "message":"Build failed for ${{ runner.os }}-${{ matrix.go-version }}; see ${{ github.event.repository.html_url }}/actions/runs/${{ github.run_id }} for more details"}' -b ~/.gitcookies https://cue-review.googlesource.com/a/changes/${{ github.event.client_payload.changeID }}/revisions/${{ github.event.client_payload.commit }}/review
 
   end:
     needs: test
     runs-on: ubuntu-latest
     steps:
-
-    # Go is required for the cue-sh/trybot action
-    - name: Install Go
-      uses: actions/setup-go@v2
-      with:
-        go-version: 1.14.x
+    - name: Write the gitcookies file
+      run: echo "$GERRIT_COOKIE" > ~/.gitcookies
 
     - name: Update Gerrit CL message with success message
-      uses: cue-sh/trybot@latest
-      with:
-        mode: end
-        runID: ${{ github.run_id }}
-        ref: ${{ github.event.client_payload.ref }}
-        changeID: ${{ github.event.client_payload.changeID }}
-        jobStatus: "success"
-        repo: ${{ github.event.repository.html_url }}
-        gerritCookie: ${{ secrets.gerritCookie }}
-
+      run: >
+        curl -s -H "Content-Type: application/json" --request POST --data '{"labels": { "Code-Review": 1 }, "message":"Build succeeded for ${{ github.event.repository.html_url }}/actions/runs/${{ github.run_id }}"}' -b ~/.gitcookies https://cue-review.googlesource.com/a/changes/${{ github.event.client_payload.changeID }}/revisions/${{ github.event.client_payload.commit }}/review