infra: Adding kokoro configs.

Signed-off-by: Tim 'mithro' Ansell <me@mith.ro>

.github/kokoro/continuous.cfg

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+build_file: "symbiflow-prjxray-artix7/.github/kokoro/full.sh"

.github/kokoro/full.sh

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+#!/bin/bash
+
+set -e
+set -x
+
+sudo apt-get update
+sudo apt-get install -y \
+        bison \
+        build-essential \
+        ca-certificates \
+        clang-format \
+        cmake \
+        curl \
+        flex \
+        fontconfig \
+        git \
+        jq \
+        python \
+        python3 \
+        python3-dev \
+        python3-virtualenv \
+        python3-yaml \
+        virtualenv \
+
+ls -l ~/.Xilinx
+sudo chown -R $USER ~/.Xilinx
+
+cd github/symbiflow-prjxray-artix7/
+
+git fetch --tags || true
+git describe --tags || true
+
+# Build the C++ tools
+make build --output-sync=target --warn-undefined-variables
+
+# Setup the Python environment
+make env --output-sync=target --warn-undefined-variables
+
+source settings/artix7.sh
+(
+	export XILINX_LOCAL_USER_DATA=no
+	cd fuzzers
+	make --output-sync=target --warn-undefined-variables QUICK=y
+)

.github/kokoro/presubmit.cfg

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+build_file: "symbiflow-prjxray-artix7/.github/kokoro/quick.sh"

.github/kokoro/quick.sh

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+full.sh