Run all unit tests on the main branch in GitHub actions.

A GitHub action which runs `make test`. The corresponding Drone pipeline can be removed later on.

.drone/drone.yml

@@ -132,6 +132,7 @@ trigger:
   - pull_request
 type: docker
 ---
+# TODO: Remove this pipeline once its GitHub actions equivalent is battle tested.
 kind: pipeline
 name: Test (Full)
 platform:

.github/workflows/test_full.yml

@@ -0,0 +1,30 @@
+name: Test (Full)
+on:
+  push:
+    branches:
+      - main
+  # TODO: Remove this later
+  pull_request:
+jobs:
+  test_linux:
+    name: Test (Full)
+    runs-on: ubuntu-latest
+    container:
+      image: grafana/alloy-build-image:v0.1.8
+      volumes:
+        - /var/run/docker.sock
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    - name: Set ownership
+      # https://github.com/actions/runner/issues/2033#issuecomment-1204205989
+      run: |
+          # this is to fix GIT not liking owner of the checkout dir
+          chown -R $(id -u):$(id -g) $PWD
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version-file: go.mod
+        # TODO: Enable caching later.
+        cache: false
+    - run: K8S_USE_DOCKER_NETWORK=1 make test