Migrate admin-tests to GitHub Actions

This is pretty straightforward, we just need to swap the CircleCI
environment variable for one supported by GitHub Actions.

.github/workflows/ci.yml

@@ -62,3 +62,11 @@ jobs:
           cd journalist_gui
           source .venv/bin/activate
           QT_QPA_PLATFORM=offscreen python3 test_gui.py -v
+
+  admin-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run tests
+        run: |
+          make -C admin test

admin/bin/dev-shell

@@ -9,6 +9,13 @@ set -euo pipefail
 TOPLEVEL=$(git rev-parse --show-toplevel)
 source "${BASH_SOURCE%/*}/../../devops/scripts/ticker"
 
+DOCKER_RUN_ARGUMENTS="${DOCKER_RUN_ARGUMENTS:-}"
+
+# Pass -it if we're a tty
+if test -t 0; then
+    DOCKER_RUN_ARGUMENTS="${DOCKER_RUN_ARGUMENTS} -it"
+fi
+
 function docker_image() {
     local out
     out="$(mktemp)"
@@ -26,16 +33,16 @@ function docker_image() {
 }
 
 function docker_run() {
-    if [ -z "${CIRCLECI-}" ]
+    if [ -z "${CI-}" ]
     then
         docker run \
             --rm \
             --user "${USER:-root}" \
             --volume "${TOPLEVEL}:/sd-root:Z" \
             --workdir "/sd-root/admin" \
-            -ti ${DOCKER_RUN_ARGUMENTS:-} securedrop-admin "$@"
+            ${DOCKER_RUN_ARGUMENTS} securedrop-admin "$@"
     else
-        docker run --rm -ti ${DOCKER_RUN_ARGUMENTS:-} securedrop-admin "$@"
+        docker run --rm ${DOCKER_RUN_ARGUMENTS} securedrop-admin "$@"
     fi
 
 }