chore: update github workflow to remove third party dependency (#788)

## Proposed Changes

- Replace `wzieba/Firebase-Distribution-Github-Action` with scripts
managed by the team

## Context

ooni/probe#2643

.github/workflows/validate.yml

@@ -128,7 +128,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Get issue number
-        uses: actions/github-script@v6
+        uses: actions/github-script@v7
         id: get_issue_number
         with:
           script: |
@@ -187,13 +187,14 @@ jobs:
           name: OoniDevFullDebugApk
 
       - name: Upload artifact to Firebase App Distribution
-        uses: wzieba/Firebase-Distribution-Github-Action@v1.7.0
         id: uploadArtifact
-        with:
-          appId: ${{secrets.FIREBASE_APP_ID}}
-          serviceCredentialsFileContent: ${{ secrets.CREDENTIAL_FILE_CONTENT }}
-          groups: testers
-          file: ooniDevFull/debug/app-ooni-dev-full-debug.apk
-      - name: Write Summary
+        env:
+          INPUT_APPID: ${{secrets.FIREBASE_APP_ID}}
+          INPUT_SERVICECREDENTIALSFILECONTENT: ${{ secrets.CREDENTIAL_FILE_CONTENT }}
+          GOOGLE_APPLICATION_CREDENTIALS: service_credentials_content.json
+          INPUT_GROUPS: testers
+          INPUT_FILE: ooniDevFull/debug/app-ooni-dev-full-debug.apk
         run: |
-          echo "View this release in the Firebase console: ${{ steps.uploadArtifact.outputs.FIREBASE_CONSOLE_URI }}" >> $GITHUB_STEP_SUMMARY
+          cat <<< "${INPUT_SERVICECREDENTIALSFILECONTENT}" > service_credentials_content.json
+          sudo npm install -g firebase-tools
+          firebase  appdistribution:distribute  "$INPUT_FILE"  --app "$INPUT_APPID" --groups "$INPUT_GROUPS"  --testers "$INPUT_TESTERS"  --release-notes "$(git log -1 --pretty=short)"