feat(GODT-2660): calculate bridge coverage and refactor CI yaml file.

utils/coverage.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+
+# Copyright (c) 2023 Proton AG
+#
+# This file is part of Proton Mail Bridge.
+#
+# Proton Mail Bridge is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Proton Mail Bridge is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Proton Mail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+
+# This script calculates coverage for bridge project
+# 
+# Output:
+#   stdout        : total coverage (to be parsed by Gitlab pipeline)
+#   coverage.xml  : Cobertura format of covered lines for coverage visualization in Gitlab
+
+# Assuming that test coverages from all jobs were put into `./coverage` folder
+# and passed as artifacts. The flags are:
+# -covermode=count
+# -coverpkg=github.com/ProtonMail/proton-bridge/v3/internal/...,github.com/ProtonMail/proton-bridge/v3/pkg/...,
+# -args -test.gocoverdir=$$PWD/coverage/${TOPIC}
+
+
+ALLINPUTS="coverage$(printf ",%s" coverage/*)"
+
+go tool covdata textfmt \
+    -i "$ALLINPUTS" \
+    -o coverage_withGen.out
+
+# Filter out auto-generated code
+grep -v '\.pb\.go' coverage_withGen.out > coverage.out
+
+# Print out coverage
+go tool cover -func=./coverage.out | grep total:
+
+# Convert to Cobertura
+#
+# NOTE: We are not using the latest `github.com/boumenot/gocover-cobertura`
+# because it does not support multiplatform coverage in one profile. See
+# https://github.com/boumenot/gocover-cobertura/pull/3#issuecomment-1571586099
+go get github.com/t-yuki/gocover-cobertura
+go run github.com/t-yuki/gocover-cobertura < ./coverage.out > coverage.xml