use sysenv for github actions

.github/workflows/build.yml

@@ -13,14 +13,18 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
 
-      - name: Load environment variables
-        run: |
-          mv src/env-template.h src/env.h
+      # - name: Load environment variables
+      #   run: |
+      #     mv src/env-template.h src/env.h
 
       - name: Installing platformio
         run: pip3 install -U platformio
 
       - name: Building a firmware
         run: |
+          export SSID=${{ secrets.WIFI_SSID }}
+          export PASS=${{ secrets.WIFI_PASS }}
+          export JOINCODE=${{ secrets.HUSARNET_JOINCODE }}
+          export HOSTNAME=${{ secrets.HUSARNET_HOSTNAME }}
           pio lib install
           pio run

platformio.ini

@@ -20,3 +20,9 @@ lib_deps =
 	adafruit/Adafruit Unified Sensor@^1.1.9
 	bblanchon/ArduinoJson@^6.21.2
 	ayushsharma82/AsyncElegantOTA@^2.2.7
+
+build_flags = 
+    -D WSSID="${sysenv.SSID}"
+    -D WPASS="${sysenv.PASS}"
+    -D HN_HOSTNAME="${sysenv.HOSTNAME}"
+    -D HN_JOINCODE="${sysenv.JOINCODE}"

src/main.cpp

@@ -1,8 +1,5 @@
 #include <Arduino.h>
 
-// Get credentials
-#include <env.h>
-
 #include <WiFi.h>
 #include <AsyncTCP.h>
 #include <ESPAsyncWebServer.h>
@@ -17,6 +14,28 @@
 #include "DHT.h"
 #include "max6675.h"
 
+#if __has_include("env.h")
+
+// For local development (rename env-template.h and type your WiFi and
+// Husarnet credentials there)
+#include <env.h>
+
+#else
+
+// For GitHub Actions OTA deployment
+
+// WiFi credentials
+#define WIFI_SSID WSSID
+#define WIFI_PASS WPASS
+
+// Husarnet credentials
+#define HUSARNET_JOIN_CODE HN_JOINCODE
+#define HUSARNET_HOSTNAME HN_HOSTNAME
+
+#endif
+
+// #include <env.h>
+
 #define LCD_SDA 21
 #define LCD_SCL 22
 #define MAX_SCK 5