meta: rename environment.sh to .env, add nextpnr-gowin

.env

@@ -4,6 +4,7 @@ export VIVADO=/tools/Xilinx/Vivado/2023.1/bin/vivado
 
 export YOSYS=/tools/oss-cad-suite/bin/yosys
 export NEXTPNR_ICE40=/tools/oss-cad-suite/bin/nextpnr-ice40
+export NEXTPNR_GOWIN=/tools/oss-cad-suite/bin/nextpnr-gowin
 export ICEPACK=/tools/oss-cad-suite/bin/icepack
 export ICEPROG=/tools/oss-cad-suite/bin/iceprog
 

.github/workflows/run_tests.yml

@@ -28,7 +28,7 @@ jobs:
 
       - name: Run tests
         run: |
-          source ./environment.sh
+          source .env
           source venv/bin/activate
           make test