Configure GitHub Actions, enable CI for testbenches

.github/workflows/test.yml

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+name: Run all testbenches
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  run_testbenches:
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/lnls-dig/gw-tb-toolchain:latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - name: Run GHDL testbenches
+        run: cd hdl/testbench && ./ghdl-ci.sh
+      - name: Run NVC testbenches
+        run: cd hdl/testbench && ./nvc-ci.sh

hdl/testbench/ghdl-ci.sh

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+#!/bin/sh
+
+set -e
+
+if ls ./*/ghdl/ 1> /dev/null 2>&1; then
+	for tb in ./*/ghdl/; do
+		echo "Testbench ${tb}"
+		cd "$tb"
+		hdlmake
+		make clean
+		make
+		cd ../../
+	done
+fi

hdl/testbench/nvc-ci.sh

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+#!/bin/sh
+
+set -e
+
+if ls ./*/nvc/ 1> /dev/null 2>&1; then
+	for tb in ./*/nvc/; do
+		echo "Testbench ${tb}"
+		cd "$tb"
+		hdlmake
+		make clean
+		make
+		cd ../../
+	done
+fi