Avoid container build by adding /.mariner-toolkit-ignore-dockerenv (#…

…7409)

Our Azure Linux builds started failing in the past week or so because Azure Linux recently made a change to how they detect container builds (see microsoft/azurelinux#11135), so the trick we employed to force a regular build (even though we're building in a container) stopped working. This change removes the trick and takes the recommended approach of adding `/.mariner-toolkit-ignore-dockerenv` to the container.

Other changes were also needed to resolve problems that came up while testing this PR:
- Snap builds began failing, seemingly due to a bad version combination of snapcraft and lxd. I updated the build task to do `snap refresh` before building.
- Our CI build for Azure Linux on arm64 uses the build scripts from the iot-identity-service repo, so I updated this repo's references to the iot-identity-service repo to fix the container build detection problem there.
- A recent update to a dependency of cross requires a newer rustc version and was causing the edgelet CI runs to fail in this PR because our rustc version is fixed at 1.73, I added the '--locked' flag to the cargo command that installs cross in the edgelet CI build.

To test, I confirmed that the CI Build passes with these changes.

## Azure IoT Edge PR checklist:

builds/checkin/edgelet.yaml

@@ -74,7 +74,7 @@ jobs:
         displayName: Set Version
       - bash: scripts/linux/generic-rust/install.sh --project-root "edgelet"
         displayName: Install Rust
-      - script: "cargo install cross --version ^0.2"
+      - script: "cargo install cross --version ^0.2 --locked"
         displayName: "Install cross"
       - script: "cross build --target armv7-unknown-linux-gnueabihf"
         displayName: armv7-unknown-linux-gnueabihf build
@@ -105,7 +105,7 @@ jobs:
         displayName: Set Version
       - bash: scripts/linux/generic-rust/install.sh --project-root "edgelet"
         displayName: Install Rust
-      - script: "cargo install cross --version ^0.2"
+      - script: "cargo install cross --version ^0.2 --locked"
         displayName: "Install cross"
       - script: "cross build --target aarch64-unknown-linux-gnu"
         displayName: aarch64-unknown-linux-gnu build

builds/misc/templates/build-packages.yaml

@@ -171,6 +171,9 @@ stages:
           - ImageOverride -equals $(image)
         steps:
           - script: |
+              #!/bin/bash
+              set -xeuo pipefail
+              sudo snap refresh
               sudo snap install snapcraft --classic
               lxd init --minimal
               SNAPCRAFT_BUILD_INFO=1 snapcraft --use-lxd

edgelet/build/linux/package-mariner.sh

@@ -40,9 +40,7 @@ apt-get install -y \
 
 rm -f /usr/bin/go
 ln -vs /usr/lib/go-1.21/bin/go /usr/bin/go
-if [ -f /.dockerenv ]; then
-    mv /.dockerenv /.dockerenv.old
-fi
+touch /.mariner-toolkit-ignore-dockerenv
 
 # Download Mariner repo and build toolkit
 mkdir -p ${MARINER_BUILD_ROOT}