chore: add test workflow on Linux

.github/workflows/tests.yml

@@ -0,0 +1,71 @@
+name: Tests
+
+on:
+  push:
+    branches:
+      - main
+      - ldez-ci
+  pull_request:
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+
+  test-linux:
+    name: Test on Linux
+    runs-on: ubuntu-latest
+    env:
+      GO_VERSION: oldstable
+    steps:
+
+      - name: Setup /etc/hosts
+        run: |
+          echo "127.0.0.1 example.letsencrypt.org" | sudo tee -a /etc/hosts
+          echo "127.0.0.1 elpmaxe.letsencrypt.org" | sudo tee -a /etc/hosts
+
+      # https://github.com/marketplace/actions/checkout
+      - name: Check out code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      # https://github.com/marketplace/actions/setup-go-environment
+      - name: Set up Go ${{ env.GO_VERSION }}
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
+      - name: apt install
+        run: sudo apt-get install snapd python3-acme python3-josepy
+
+      - name: snap install
+        run: sudo snap install core && sudo snap refresh core
+
+      - name: snap install certbot
+        run: sudo snap install --classic certbot && sudo ln -s /snap/bin/certbot /usr/bin/certbot
+
+      - name: go install tools
+        run: go install golang.org/x/tools/cmd/cover@latest
+
+      - name: go install goveralls
+        run: go install github.com/mattn/goveralls@latest
+
+      - name: go install
+        run: go install -v -race ./...
+
+      - name: launch pebble
+        run: GORACE="halt_on_error=1" PEBBLE_WFE_NONCEREJECT=0 pebble &
+
+      # Run project unit tests (with the race detector enabled and atomic coverage profile collection)
+      - name: unittests
+        run: go test -v -race -covermode=atomic -coverprofile=coverage.out ./...
+
+#      # Upload collected coverage profile to goveralls
+#      - name: goveralls
+#        run: goveralls -coverprofile=coverage.out -service=github
+
+      # Perform a test issuance with chisel2.py
+      - name: chisel
+        run: REQUESTS_CA_BUNDLE=./test/certs/pebble.minica.pem python ./test/chisel2.py example.letsencrypt.org elpmaxe.letsencrypt.org