Run integration test CI in parallel (#8156)

.github/workflows/integration.yaml

@@ -35,6 +35,11 @@ jobs:
     name: Integration Tests
     runs-on: ubuntu-20.04
     timeout-minutes: 45
+    strategy:
+      fail-fast: false
+      matrix:
+        itest: [certrotation, etcdrestore, localstorage, startup, custometcdargs, etcdsnapshot, kubeflags, longhorn, secretsencryption]
+      max-parallel: 3
     steps:
     - name: Checkout
       uses: actions/checkout@v3
@@ -58,16 +63,16 @@ jobs:
       run: | 
         chmod +x ./dist/artifacts/k3s
         mkdir -p $GOCOVERDIR
-        sudo -E env "PATH=$PATH" go test -v -timeout=45m ./tests/integration/... -run Integration
+        sudo -E env "PATH=$PATH" go test -v -timeout=45m ./tests/integration/${{ matrix.itest }}/... -run Integration
     - name: On Failure, Launch Debug Session
       if: ${{ failure() }}
       uses: mxschmitt/action-tmate@v3
       timeout-minutes: 5
     - name: Generate coverage report
-      run: go tool covdata textfmt -i $GOCOVERDIR -o coverage.out
+      run: go tool covdata textfmt -i $GOCOVERDIR -o ${{ matrix.itest }}.out
     - name: Upload Results To Codecov
       uses: codecov/codecov-action@v3
       with:
-        files: ./coverage.out
+        files: ./${{ matrix.itest }}.out
         flags: inttests # optional
         verbose: true # optional (default = false)
\ No newline at end of file

Dockerfile.test

@@ -44,7 +44,7 @@ RUN vagrant box add generic/ubuntu2004 --provider libvirt --force
 RUN curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"; \
     chmod +x ./kubectl; \
     mv ./kubectl /usr/local/bin/kubectl
-RUN GO_VERSION=$(curl https://go.dev/VERSION?m=text); \
+RUN GO_VERSION=go1.20.6; \
     curl -O -L "https://golang.org/dl/${GO_VERSION}.linux-amd64.tar.gz"; \
     rm -rf /usr/local/go; \
     tar -C /usr/local -xzf ${GO_VERSION}.linux-amd64.tar.gz;