Fix workflows failing because releases weren't being found (#130)

GitHub [rate limits API
requests](https://docs.github.com/en/rest/using-the-rest-api/rate-limits-for-the-rest-api?apiVersion=2022-11-28).
The `install.sh` script uses the API through `curl` to determine the
download URL for the correct PhotonVision jar file for each image.
Building the images resulted in enough closely spaced calls to trigger
the rate limit for some runners with the resulting response from the
server:
```
{"message":"API rate limit exceeded for XXX.XXX.XXX.XXX. (But here'\''s the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.)","documentation_url":"https://docs.github.com/rest/overview/resources-in-the-rest-api#rate-limiting"}
```
This PR fixes the problem by allowing then `install.sh` script to use
the GITHUB_TOKEN to authenticate the request when it is running as a
workflow.

Author: crschardt

.github/workflows/main.yml

@@ -97,6 +97,8 @@ jobs:
     - name: Install dependencies and build image
       uses: photonvision/photon-image-runner@HEAD
       id: install_deps
+      env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       with:
         minimum_free_mb: 2000
         image_url: ${{ matrix.base_image }}

install.sh

@@ -212,8 +212,15 @@ else
   RELEASE_URL="https://api.github.com/repos/photonvision/photonvision/releases/tags/$VERSION"
 fi
 
-DOWNLOAD_URL=$(curl -sk "$RELEASE_URL" |
-                  grep "browser_download_url.*$ARCH_NAME.jar" |
+# use GITHUB TOKEN when available to authenticate
+if [[ -n $GH_TOKEN ]]; then
+  RELEASES=$(curl -s -H "Authorization: Bearer $GH_TOKEN" "$RELEASE_URL")
+else
+  RELEASES=$(curl -sk "$RELEASE_URL")
+fi
+
+DOWNLOAD_URL=$(echo "$RELEASES" |
+                  grep "browser_download_url.*${ARCH_NAME}\.jar" |
                   cut -d : -f 2,3 |
                   tr -d '"'
               )