Add workflow for testing contrib repo (open-telemetry#232)

* Add workflow for testing contrib repo

Fixes open-telemetry#199

* Add changes suggested by @djaglowski in code review

* Ignore top level module and add -compat to go mod tidy

.github/workflows/contrib-tests.yml

@@ -0,0 +1,23 @@
+name: contrib-tests
+on:
+  push:
+    branches: [ main ]
+    tags:
+      - v[0-9]+.[0-9]+.[0-9]+.*
+  pull_request:
+
+jobs:
+  contrib_tests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v2
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17
+      - name: Run Contrib Tests
+        run: |
+          contrib_path=/tmp/opentelemetry-collector-contrib
+          git clone https://github.com/open-telemetry/opentelemetry-collector-contrib.git $contrib_path
+          ./check-contrib.sh

check-contrib.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+set -e
+
+CURDIR=$(pwd)
+CONTRIB_PATH="/tmp/opentelemetry-collector-contrib"
+LOG_COLLECTION_MOD_NAME="github.com/open-telemetry/opentelemetry-log-collection"
+LOG_COLLECTION_MODULES=$(find ${CONTRIB_PATH} ! -path ${CONTRIB_PATH}/go.mod ! -path ${CONTRIB_PATH}/cmd/configschema/go.mod -type f -name "go.mod" -exec grep -l ${LOG_COLLECTION_MOD_NAME} {} \; | xargs -L 1 dirname | sort)
+echo "Log collection modules - ${LOG_COLLECTION_MODULES}"
+
+for module in ${LOG_COLLECTION_MODULES}
+do
+  pushd ${module}
+  go mod edit -replace github.com/open-telemetry/opentelemetry-log-collection=${CURDIR}
+  rm -fr go.sum
+  go mod tidy -compat=1.17
+  go test
+  go mod edit -dropreplace github.com/open-telemetry/opentelemetry-log-collection
+  popd
+done