Use commit instead of version for github actions.

.github/workflows/build.yml

@@ -39,18 +39,18 @@ jobs:
           docker-images: true
           swap-storage: false
 
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           # Ensure we are building the branch and not the branch after being merged on develop
           # https://github.com/actions/checkout/issues/881
           ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.ref }}
       - name: Use JDK 21
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5.2.0
         with:
           distribution: 'temurin' # See 'Supported distributions' for available options
           java-version: '21'
       - name: Configure gradle
-        uses: gradle/actions/setup-gradle@v5
+        uses: gradle/actions/setup-gradle@0723195856401067f7a2779048b490ace7a47d7c # v5.0.2
         with:
           cache-read-only: ${{ github.ref != 'refs/heads/develop' }}
       - name: Assemble debug APKs
@@ -68,7 +68,7 @@ jobs:
         run: ./gradlew :app:assembleGplayDebug app:assembleFDroidDebug -PallWarningsAsErrors=true $CI_GRADLE_ARG_PROPERTIES
       - name: Upload debug APKs
         if: ${{ matrix.variant == 'debug' }}
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
         with:
           name: elementx-debug
           path: |