build: docker run: make "-it" flags conditional on tty being available

from https://stackoverflow.com/a/69088164

I am trying to run the build.sh scripts directly on a cirrus CI runner, and "docker run -it" is erroring due to lack of a tty.

contrib/android/build.sh

@@ -63,11 +63,14 @@ else
 fi
 
 DOCKER_RUN_FLAGS=""
-
 if [[ "$3" == "release" ]] ; then
     info "'release' mode selected. mounting ~/.keystore inside container."
     DOCKER_RUN_FLAGS="-v $HOME/.keystore:/home/user/.keystore"
 fi
+if sh -c ": >/dev/tty" >/dev/null 2>/dev/null; then
+    info "/dev/tty is available and usable"
+    DOCKER_RUN_FLAGS="$DOCKER_RUN_FLAGS -it"
+fi
 
 info "building binary..."
 mkdir --parents "$PROJECT_ROOT_OR_FRESHCLONE_ROOT"/.buildozer/.gradle
@@ -78,7 +81,7 @@ if [ ! -z "$ELECBUILD_COMMIT" ] ; then  # fresh clone (reproducible build)
         sudo chown -R 1000:1000 "$FRESH_CLONE"
     fi
 fi
-docker run -it --rm \
+docker run --rm \
     --name electrum-android-builder-cont \
     -v "$PROJECT_ROOT_OR_FRESHCLONE_ROOT":/home/user/wspace/electrum \
     -v "$PROJECT_ROOT_OR_FRESHCLONE_ROOT"/.buildozer/.gradle:/home/user/.gradle \

contrib/build-linux/appimage/build.sh

@@ -50,6 +50,12 @@ fi
 # defined in the type2-runtime repo (patched with type2-runtime-reproducible-build.patch)
 "$CONTRIB_APPIMAGE/make_type2_runtime.sh" || fail "Error building type2-runtime."
 
+DOCKER_RUN_FLAGS=""
+if sh -c ": >/dev/tty" >/dev/null 2>/dev/null; then
+    info "/dev/tty is available and usable"
+    DOCKER_RUN_FLAGS="-it"
+fi
+
 info "building binary..."
 # check uid and maybe chown. see #8261
 if [ ! -z "$ELECBUILD_COMMIT" ] ; then  # fresh clone (reproducible build)
@@ -58,7 +64,7 @@ if [ ! -z "$ELECBUILD_COMMIT" ] ; then  # fresh clone (reproducible build)
         sudo chown -R 1000:1000 "$FRESH_CLONE"
     fi
 fi
-docker run -it \
+docker run $DOCKER_RUN_FLAGS \
     --name electrum-appimage-builder-cont \
     -v "$PROJECT_ROOT_OR_FRESHCLONE_ROOT":/opt/electrum \
     --rm \

contrib/build-linux/sdist/build.sh

@@ -46,6 +46,12 @@ else
     info "not doing fresh clone."
 fi
 
+DOCKER_RUN_FLAGS=""
+if sh -c ": >/dev/tty" >/dev/null 2>/dev/null; then
+    info "/dev/tty is available and usable"
+    DOCKER_RUN_FLAGS="-it"
+fi
+
 info "building binary..."
 # check uid and maybe chown. see #8261
 if [ ! -z "$ELECBUILD_COMMIT" ] ; then  # fresh clone (reproducible build)
@@ -54,7 +60,7 @@ if [ ! -z "$ELECBUILD_COMMIT" ] ; then  # fresh clone (reproducible build)
         sudo chown -R 1000:1000 "$FRESH_CLONE"
     fi
 fi
-docker run -it \
+docker run $DOCKER_RUN_FLAGS \
     --name electrum-sdist-builder-cont \
     -v "$PROJECT_ROOT_OR_FRESHCLONE_ROOT":/opt/electrum \
     --rm \

contrib/build-wine/build.sh

@@ -48,6 +48,12 @@ else
     info "not doing fresh clone."
 fi
 
+DOCKER_RUN_FLAGS=""
+if sh -c ": >/dev/tty" >/dev/null 2>/dev/null; then
+    info "/dev/tty is available and usable"
+    DOCKER_RUN_FLAGS="-it"
+fi
+
 info "building binary..."
 # check uid and maybe chown. see #8261
 if [ ! -z "$ELECBUILD_COMMIT" ] ; then  # fresh clone (reproducible build)
@@ -56,7 +62,7 @@ if [ ! -z "$ELECBUILD_COMMIT" ] ; then  # fresh clone (reproducible build)
         sudo chown -R 1000:1000 "$FRESH_CLONE"
     fi
 fi
-docker run -it \
+docker run $DOCKER_RUN_FLAGS \
     --name electrum-wine-builder-cont \
     -v "$PROJECT_ROOT_OR_FRESHCLONE_ROOT":/opt/wine64/drive_c/electrum \
     --rm \