Issue with self signed certificates when installing extensions

Version: 1.45.0
Commit: d69a79b73808559a91206d73d7717ff5f798f23c
Date: 2020-05-07T15:57:33.467Z (5 days ago)
Electron: 7.2.4
Chrome: 78.0.3904.130
Node.js: 12.8.1
V8: 7.8.279.23-electron.0
OS: Darwin x64 18.7.0

I am using a very simple environment using a dockerfile behind a corporate network. I am able to install extensions locally fine without any issues however this fails when attempting to install them within the docker container

.devcontainer.json file:

{
    "name": "My-Project",
    "dockerFile": "./Dockerfile",
    "settings": {
        "terminal.integrated.shell.linux": "/bin/bash",
        "http.proxyStrictSSL": false
    },
    "extensions" : [
        "docsmsft.docs-yaml",
        "GrapeCity.gc-excelviewer",
        "Gruntfuggly.todo-tree",
        "Ikuyadeu.r",
        "ionutvmi.path-autocomplete",
        "ivan-bocharov.stan-vscode",
        "ms-azuretools.vscode-docker",
        "ms-python.python",
        "ms-vscode-remote.remote-containers",
        "notZaki.pandocciter",
        "redhat.vscode-yaml",
        "REditorSupport.r-lsp",
        "ryuta46.multi-command",
        "thenikso.github-plus-theme",
        "VisualStudioExptTeam.vscodeintellicode",
        "vscode-icons-team.vscode-icons",
        "vscodevim.vim",
        "edonet.vscode-command-runner"
    ]
}

Dockerfile

FROM ubuntu:18.04

When the container is being built I then get the following messages

3568 ms] Start: Run in container: cd /root/.vscode-server/bin/d69a79b73808559a91206d73d7717ff5f798f23c; export VSCODE_AGENT_FOLDER=/root/.vscode-server; /root/.vscode-server/bin/d69a79b73808559a91206d73d7717ff5f798f23c/server.sh --install-extension docsmsft.docs-yaml --install-extension GrapeCity.gc-excelviewer --install-extension Gruntfuggly.todo-tree --install-extension Ikuyadeu.r --install-extension ionutvmi.path-autocomplete --install-extension ivan-bocharov.stan-vscode --install-extension ms-azuretools.vscode-docker --install-extension ms-python.python --install-extension ms-vscode-remote.remote-containers --install-extension notZaki.pandocciter --install-extension redhat.vscode-yaml --install-extension REditorSupport.r-lsp --install-extension ryuta46.multi-command --install-extension thenikso.github-plus-theme --install-extension VisualStudioExptTeam.vscodeintellicode --install-extension vscode-icons-team.vscode-icons --install-extension vscodevim.vim --install-extension edonet.vscode-command-runner --force
[27816 ms] Installing extensions...
[27816 ms] self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
self signed certificate in certificate chain
getaddrinfo EAI_AGAIN edonet.gallery.vsassets.io
[27816 ms] Exit code 1

Note that the container still builds and runs fine, just that when I access it none of the extensions are installed. Though the extensions are all still listed (see screenshot below) and I can click through and manually install them all (with the exception of the python extension that still won't install)

Any advice on how to solve this would be appreciated