[FEATURE_SD] Add build in Platformio.ini with SD enabled (#2700 )

Fixes: #2700 

This does make sure we build more often with `FEATURE_SD` and `FEATURE_MDNS` enabled.

.travis.yml

@@ -64,7 +64,8 @@ script:
   - PLATFORMIO_BUILD_FLAGS="-D CONTINUOUS_INTEGRATION" platformio run -e normal_sdk3_ESP8266_1M
   - PLATFORMIO_BUILD_FLAGS="-D CONTINUOUS_INTEGRATION" platformio run -e test_ESP32-wrover-kit_4M316k
   - PLATFORMIO_BUILD_FLAGS="-D CONTINUOUS_INTEGRATION" platformio run -e test_ESP32_4M316k
-  - PLATFORMIO_BUILD_FLAGS="-D CONTINUOUS_INTEGRATION" platformio run -e test_ESP8266_4M_VCC
+  - PLATFORMIO_BUILD_FLAGS="-D CONTINUOUS_INTEGRATION" platformio run -e test_ESP8266_4M1M_VCC
+  - PLATFORMIO_BUILD_FLAGS="-D CONTINUOUS_INTEGRATION" platformio run -e test_ESP8266_4M1M_VCC_MDNS_SD
   #- PLATFORMIO_BUILD_FLAGS="-D CONTINUOUS_INTEGRATION" platformio run -e test_beta_ESP8266_16M
   - PLATFORMIO_BUILD_FLAGS="-D CONTINUOUS_INTEGRATION" platformio run -e test_beta_ESP8266_4M1M
 

platformio_esp82xx_envs.ini

@@ -232,12 +232,23 @@ build_flags               = ${normal_ir_extended_no_rx.build_flags}
 
 
 ; TEST: 4096k version + FEATURE_ADC_VCC ----------
-[env:test_ESP8266_4M_VCC]
+[env:test_ESP8266_4M1M_VCC]
 extends                   = esp8266_4M1M
 platform                  = ${testing.platform}
 build_flags               = ${testing.build_flags}
                             ${esp8266_4M1M.build_flags}
-                            -D FEATURE_ADC_VCC=true
+                            -DFEATURE_ADC_VCC=true
+
+; TEST: 4096k version + FEATURE_ADC_VCC + FEATURE_MDNS + FEATURE_SD ----------
+[env:test_ESP8266_4M1M_VCC_MDNS_SD]
+extends                   = esp8266_4M1M
+platform                  = ${testing.platform}
+build_flags               = ${testing.build_flags}
+                            ${esp8266_4M1M.build_flags}
+                            -DFEATURE_ADC_VCC=true
+                            -DFEATURE_MDNS
+                            -DFEATURE_SD
+lib_ignore                = ESP32_ping, ESP32WebServer, IRremoteESP8266, HeatpumpIR
 
 
 [env:test_beta_ESP8266_4M1M]

pre_custom_esp82xx.py

@@ -40,6 +40,7 @@ else:
     "USES_C018",  # TTN/RN2483
 
     "FEATURE_MDNS",
+    "FEATURE_SD",
 
     "USE_SETTINGS_ARCHIVE"
   ])