[jenkins] add triqs-docker-based linux builds

.dockerignore

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+.git
+Dockerfile
+Jenkinsfile

Dockerfile

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+# See ../triqs/packaging for other options
+FROM flatironinstitute/triqs:master-ubuntu-clang
+
+COPY . ${SRC}/dft_tools
+WORKDIR ${BUILD}/dft_tools
+RUN chown build .
+USER build
+RUN cmake ${SRC}/dft_tools -DTRIQS_ROOT=${INSTALL} && make -j2 && make test
+USER root
+RUN make install

Jenkinsfile

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+properties([
+  disableConcurrentBuilds(),
+  pipelineTriggers([
+    upstream(
+      threshold: 'SUCCESS',
+      upstreamProjects: '/TRIQS/triqs/' + env.BRANCH_NAME.replaceAll('/', '%2F')
+    )
+  ])
+])
+
+def platforms = [:]
+
+def dockerPlatforms = ["ubuntu-clang", "ubuntu-gcc", "centos-gcc"]
+for (int i = 0; i < dockerPlatforms.size(); i++) {
+  def platform = dockerPlatforms[i]
+  platforms[platform] = { ->
+    stage(platform) {
+      timeout(time: 1, unit: 'HOURS') {
+	node('docker') {
+	  checkout scm
+	  /* construct a Dockerfile for this base */
+	  sh '''
+	    ( echo "FROM flatironinstitute/triqs:$BRANCH_NAME-$STAGE_NAME" ; sed '0,/^FROM /d' Dockerfile ) > Dockerfile.jenkins
+	    mv -f Dockerfile.jenkins Dockerfile
+	  '''
+	  /* build and tag */
+	  def img = docker.build("flatironinstitute/dft_tools:${env.BRANCH_NAME}-${env.STAGE_NAME}")
+	}
+      }
+    }
+  }
+}
+
+parallel platforms