Fix inconsistent indentation of compile-examples workflow file

The first indent was one space, which made it very challenging to get indentation right while working with this file.

Author: per1234

.github/workflows/compile-examples.yml

@@ -1,30 +1,30 @@
 name: Compile Examples
 on: [push, pull_request]
 jobs:
- build:
-   runs-on: ubuntu-latest
+  build:
+    runs-on: ubuntu-latest
 
-   env:
-     LIBRARIES: Arduino_DebugUtils WiFi101 WiFiNINA MKRGSM MKRNB MKRWAN
-   strategy:
-     matrix:
-       fqbn: [
-         "arduino:samd:mkr1000",
-         "arduino:samd:mkrwifi1010",
-         "arduino:samd:nano_33_iot",
-         "arduino:samd:mkrgsm1400",
-         "arduino:samd:mkrnb1500",
-         "arduino:samd:mkrwan1300",
-         "arduino:samd:mkrwan1310",
-         '"esp8266:esp8266:huzzah" "https://arduino.esp8266.com/stable/package_esp8266com_index.json"'
-       ]
+    env:
+      LIBRARIES: Arduino_DebugUtils WiFi101 WiFiNINA MKRGSM MKRNB MKRWAN
+    strategy:
+      matrix:
+        fqbn: [
+          "arduino:samd:mkr1000",
+          "arduino:samd:mkrwifi1010",
+          "arduino:samd:nano_33_iot",
+          "arduino:samd:mkrgsm1400",
+          "arduino:samd:mkrnb1500",
+          "arduino:samd:mkrwan1300",
+          "arduino:samd:mkrwan1310",
+          '"esp8266:esp8266:huzzah" "https://arduino.esp8266.com/stable/package_esp8266com_index.json"'
+        ]
 
-   steps:
-     - uses: actions/checkout@v1
-       with:
-         fetch-depth: 1
-     - name: Compile examples
-       uses: arduino/actions/libraries/compile-examples@master
-       with:
-         fqbn: ${{ matrix.fqbn }}
-         libraries: ${{ env.LIBRARIES }}
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
+      - name: Compile examples
+        uses: arduino/actions/libraries/compile-examples@master
+        with:
+          fqbn: ${{ matrix.fqbn }}
+          libraries: ${{ env.LIBRARIES }}