Add SNAPCRAFT_BUILD_ENVIRONMENT variable to Linux build jobs in CI workflows

Author: digimezzo

.github/workflows/merge.yml

@@ -9,6 +9,8 @@ jobs:
     merge_build_on_linux:
         runs-on: ubuntu-22.04
         if: github.event.pull_request.merged == true
+        env:
+            SNAPCRAFT_BUILD_ENVIRONMENT: destructive
         steps:
             - uses: actions/checkout@v2
             - uses: actions/setup-node@master

.github/workflows/nightly.yml

@@ -9,6 +9,8 @@ on:
 jobs:
     nightly_build_on_linux:
         runs-on: ubuntu-22.04
+        env:
+            SNAPCRAFT_BUILD_ENVIRONMENT: destructive
         steps:
             - uses: actions/checkout@v2
             - uses: actions/setup-node@master