terraform-provider: init provider scaffolding (#2632)

* terraform-provider: init

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* terraform-provider: add basic docgen

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* terraform-provider: fix build steps

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* terraform-provider: extend build process and docgen

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* dev-docs: document provider usage

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* bazel: upload aspect lib mirror

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* bazel: add docstring to fix linter

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* terraform-provider: don't try to create lockfiles

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* bazel: fix shellcheck issues

* bazel: separate paths to check

* bazel: explain what updating lockfiles means

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* terraform-provider: fix linter checks

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

---------

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>
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# Constellation Terraform Provider
This document explains the basic ways of working with the [Constellation Terraform Provider](../../terraform-provider-constellation/).
## Building the Terraform Provider
The Constellation Terraform provider can be built through Bazel, either via the [`devbuild` target](./build-develop-deploy.md) (recommended), which will create a `terraform` directory
with the provider binary and some utility files in the current working directory, or explicitly via this command:
```bash
bazel build //terraform-provider-constellation:tf_provider
```
## Using the Terraform Provider
The Terraform provider binary can be used with the normal Terraform CLI, by setting a [development override](https://developer.hashicorp.com/terraform/cli/config/config-file#development-overrides-for-provider-developers),
so that the registry path to the provider is replaced with the path to the locally built provider. If using the [`devbuild` target](./build-develop-deploy.md), a `config.tfrc` file with the override set to the path
of the built binary is placed automatically in the `terraform` directory in the current working directory. Otherwise, the file can be also built and copied to the current working directory explicitly via this command:
```bash
bazel build //terraform-provider-constellation:terraform_rc
cp bazel-bin/terraform-provider-constellation/config.tfrc .
sed -i "s|@@TERRAFORM_PROVIDER_PATH@@|$(realpath bazel-bin/terraform-provider-constellation/tf_provider_/tf_provider)|g" config.tfrc
```
Afterwards, all Terraform commands that should use the local provider build should be prefixed with `TF_CLI_CONFIG_FILE=config.tfrc` like so:
```bash
TF_CLI_CONFIG_FILE=config.tfrc terraform init
TF_CLI_CONFIG_FILE=config.tfrc terraform apply
...
```