fix(dgw): self-signed TLS certificate generation of the Docker image build

[Copilot]

Self-signed TLS certificate generation in the Docker entrypoint fails because OpenSSL receives undefined variables for output paths.

Root cause:
Lines 190-191 define $TlsPrivateKeyFile and $TlsCertificateFile, but lines 195-196 reference undefined $PrivateKeyFile and $CertificateFile (missing Tls prefix).

Changes:

• Corrected variable references in OpenSSL arguments to match declared variable names

# Before
"-keyout", $PrivateKeyFile,      # undefined
"-out", $CertificateFile,        # undefined

# After  
"-keyout", $TlsPrivateKeyFile,   # matches line 191
"-out", $TlsCertificateFile,     # matches line 190

This prevents the error:

Get-Content: Cannot find path '/tmp/gateway-{hostname}.pem' because it does not exist.
Exception: Empty certificate chain!

Original prompt

Bug Description

In package/Linux/entrypoint.ps1, there's a variable name mismatch in the self-signed TLS certificate generation code that causes certificate files to never be created.

Current Behavior

When the script attempts to generate a self-signed certificate, it fails with:

Generating self-signed TLS certificate for '8407599dc491'...
Get-Content: Cannot find path '/tmp/gateway-8407599dc491.pem' because it does not exist.
Get-Content: Cannot find path '/tmp/gateway-8407599dc491.key' because it does not exist.
Exception: Empty certificate chain!

Root Cause

Lines 188-190 use incorrect variable names ($PrivateKeyFile and $CertificateFile) in the OpenSSL arguments, but the actual variables defined on lines 185-186 are $TlsPrivateKeyFile and $TlsCertificateFile.

# Lines 185-186: Variables are defined as
$TlsCertificateFile = "/tmp/gateway-$Hostname.pem"
$TlsPrivateKeyFile = "/tmp/gateway-$Hostname.key"

# Lines 188-190: But OpenSSL uses wrong variable names
$Arguments = @(
    "req", "-x509", "-nodes",
    "-newkey", "rsa:2048",
    "-keyout", $PrivateKeyFile,      # ❌ Wrong - should be $TlsPrivateKeyFile
    "-out", $CertificateFile,        # ❌ Wrong - should be $TlsCertificateFile
    "-subj", "/CN=$Hostname",
    "-days", "1825"
)

Required Fix

Change lines 189-190 in package/Linux/entrypoint.ps1 to use the correct variable names:

"-keyout", $TlsPrivateKeyFile,
"-out", $TlsCertificateFile,

File Location

• File: package/Linux/entrypoint.ps1
• Lines: 189-190
• Commit: 9f0666c

This pull request was created from Copilot chat.

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[Dahllias]

LGTM

[CBenoit]

LGTM!