Add CodeCov GitHub Action (#467)

* Add CodeCov GitHub Action

* Address Sundar's comment about blocking on coverage.

Since currently testing of components-contrib usually require building
with dapr/dapr, we don't yet have a lot of coverage. So we shouldn't
block PRs based on that.

.codecov.yaml

@@ -0,0 +1,15 @@
+coverage:
+  # Commit status https://docs.codecov.io/docs/commit-status are used
+  # to block PR based on coverage threshold.
+  status:
+    project:
+      default:
+        informational: true
+    patch:
+      # Disable the coverage threshold of the patch, so that PRs are
+      # only failing because of overall project coverage threshold.
+      # See https://docs.codecov.io/docs/commit-status#disabling-a-status.
+      default: false
+comment:
+  # Delete old comment and post new one for new coverage information.
+  behavior: new

.github/workflows/components-contrib.yml

@@ -60,5 +60,10 @@ jobs:
         if: matrix.target_arch != 'arm'
         run: make go.mod check-diff
       - name: Run make test
+        env:
+          COVERAGE_OPTS: "-coverprofile=coverage.txt -covermode=atomic"
         if: matrix.target_arch != 'arm'
         run: make test
+      - name: Codecov
+        if: matrix.target_arch == 'amd64' && matrix.target_os == 'linux'
+        uses: codecov/codecov-action@v1

Makefile

@@ -51,7 +51,7 @@ endif
 ################################################################################
 .PHONY: test
 test:
-	go test ./...
+	go test ./... $(COVERAGE_OPTS)
 
 ################################################################################
 # Target: lint                                                                 #