Merge ~virtustom/ubuntu-docker-images/+git/utils:skopeo into ~ubuntu-docker-images/ubuntu-docker-images/+git/utils:main

[Tomáš Virtus]

Refactor to use Skopeo

Unmerged commits

8635014... by Tomáš Virtus on 2022-04-25

Skip validation when DEBUG_SKIP_VALIDATION=1

Useful for debugging scripts in test repositories. It's still checked
that the specified image exists in given repository.

1a8704b... by Tomáš Virtus on 2022-04-24

build: Install skopeo in Dockerfile

It will be used for interaction with registries instead of direct API
calls via curl. Skopeo handles OAuth seamlessly. Install it from
official image[1].

[1] https://github.com/containers/skopeo/blob/main/install.md#container-images

9be5b99... by Tomáš Virtus on 2022-04-24

build: Fix azure-cli install in Dockerfile

Proper instructions for Ubuntu are at
https://docs.microsoft.com/en-us/cli/azure/install-azure-cli-linux?pivots=apt

922685e... by Tomáš Virtus on 2022-04-24

build: Dockerfile: Use focal as stable base

Third-party apt repositories may not have packages for latest. Use focal
as base for now until 3rd-party packages for jammy are available. E.g.
azure-cli is not yet available for jammy because jammy moved to libssl3
from libssl1.1.

8eef67f... by Tomáš Virtus on 2022-04-24

build: Dockerfile: Use curl instead of ADD

ADD prevents caching of subsequent directives; every builds runs from
first ADD directive even if nothing changes. Use curl instead.

4e80dbd... by Tomáš Virtus on 2022-04-24

build: Add .dockerignore

Ignore Dockerfile so that "COPY . /src" won't invalidate its and
subsequent cached layers when Dockerfile is edited. Also ignore Vim swap
files, .git and .dockerignore itself.

diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..6358c9e
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,4 @@
+Dockerfile
+.dockerignore
+.git
+**/.*.sw[po]
diff --git a/Dockerfile b/Dockerfile
index aea8a42..c206066 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,8 @@
 #   -v ${PATH_TO_AWS_CONFIG}:/root/.aws/config:ro \
 #   -v ${PATH_TO_AWS_CREDENTIALS}:/root/.aws/credentials:ro \
 #   localhost/tagger:latest ARGS_TO_tag-images.sh
-FROM ubuntu:latest as build
+FROM quay.io/skopeo/stable as skopeo
+FROM ubuntu:focal as build
 ENV TZ=UTC
 RUN apt-get update
 RUN DEBIAN_FRONTEND=noninteractive apt-get full-upgrade -y
@@ -17,20 +18,24 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
     ca-certificates \
     unzip \
     jq \
-    docker.io
-ADD https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip awscliv2.zip
+    docker.io \
+    gpg \
+    libgpgme11 \
+    libassuan0
+RUN curl -fsSL https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip -o awscliv2.zip
 RUN unzip awscliv2.zip
 RUN ./aws/install
 RUN rm -rf ./aws awscliv2.zip
 COPY . /src
 RUN mkdir -p /root/.aws
-RUN . /etc/os-release && curl -O https://packages.microsoft.com/config/ubuntu/$VERSION_ID/packages-microsoft-prod.deb
-RUN apt-get install -y ./packages-microsoft-prod.deb
+RUN curl -fsSL https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor >/usr/share/keyrings/microsoft.gpg
+RUN echo "deb [signed-by=/usr/share/keyrings/microsoft.gpg] https://packages.microsoft.com/repos/azure-cli $(. /etc/os-release && echo $UBUNTU_CODENAME) main" \
+  >/etc/apt/sources.list.d/azure-cli.list
 RUN apt-get update
 RUN apt-get install -y azure-cli
-RUN rm -f packages-microsoft-prod.deb
 RUN DEBIAN_FRONTEND=noninteractive apt-get remove --purge --auto-remove -y
 RUN rm -rf /var/lib/apt/lists/*
+COPY --from=skopeo /usr/bin/skopeo /usr/bin/skopeo
 FROM scratch
 COPY --from=build / /
 WORKDIR /src
diff --git a/helpers/validate-args.sh b/helpers/validate-args.sh
index f5792aa..7d5f7e1 100644
--- a/helpers/validate-args.sh
+++ b/helpers/validate-args.sh
@@ -32,6 +32,10 @@ validate_var ()
 
 validate_registry ()
 {
+    if [[ ${DEBUG_SKIP_VALIDATION:-0} == 1 ]]; then
+	return 0
+    fi
+
     local registry="$1"
     local registry_regex
 
@@ -47,6 +51,10 @@ validate_registry ()
 
 validate_namespace ()
 {
+    if [[ ${DEBUG_SKIP_VALIDATION:-0} == 1 ]]; then
+	return 0
+    fi
+
     local namespace="$1"
     local registry_regex=${namespace_registry_regexes[$namespace]}