cc: @samcm

min config:
```yaml
 additional_services:
  - tracoor
```

---------
Co-authored-by: Sam Calder-Mason <sam@puritydev.io>

Address #653 

Adds 0-padding and indexes at 1 for vc_count.

Co-authored-by: Barnabas Busa <busa.barnabas@gmail.com>

Allow using a custom dora image and specifying custom env variables.
This is especially useful for early testnets that might need disabling
some features via ENV vars
(eg. `KILLSWITCH_DISABLE_SSZ_REQUESTS=true`,
`KILLSWITCH_DISABLE_SSZ_ENCODING=true`)

This PR adds a new config argument called `participants_matrix`, which
allows the user to easily spin up a matrix of EL/CL combos. The `el` and
`cl` keys within this argument can be fully fledged normal
`participants`, so they support the exact same arguments.

For example:

# Example 1
```
participants_matrix:
  el:
  - el_type: geth
  - el_type: besu
  - el_type: reth
  cl:
  - cl_type: nimbus
 ```
 
 
 This config would create the following participants:
 - `nimbus-geth`
 - `nimbus-besu`
 - `nimbus-reth`

# Example 2
```
participants_matrix:
  el:
  - el_type: geth
  - el_type: besu
  - el_type: reth
  cl:
  - cl_type: nimbus
participants:
 - el_type: nethermind
   cl_type: lighthouse
 ```
 This config would create the following participants:
 - `nimbus-geth`
 - `nimbus-besu`
 - `nimbus-reth`
 - `lighthouse-nethermind`
 
 
# Example 3
```
participants_matrix:
  el:
  - el_type: geth
  - el_type: besu
  - el_type: reth
  cl:
  - cl_type: nimbus
     count: 5
 ```
 This config would create the following participants:
 - `5x nimbus-geth`
 - `5x nimbus-besu`
 - `5x nimbus-reth`

---------
Co-authored-by: Barnabas Busa <busa.barnabas@gmail.com>

Co-authored-by: Barnabas Busa <busa.barnabas@gmail.com>

The flag `--validators-builder-registration-default-enabled` must be
used when VC/BN are combined. Otherwise validators won't be registered.

At startup Besu does not return a good gas price estimation (WIP to fix
this) and the default number of accepted connection is not enough to
sustain the tx_spammer, so this PR tune some options to allow to use the
tx_spammer wth Besu.

---------
Co-authored-by: Barnabas Busa <barnabas.busa@ethereum.org>

* use `electra-support` image for assertoor when electra fork epoch is
set
* use `peerdas-support` image for assertoor when peer das fork epoch is
set
* use `latest` image for minimal preset (now naively supported)

---------
Co-authored-by: Barnabas Busa <busa.barnabas@gmail.com>

Serves all network config files via apache under the `/network-configs/
path.

```
/network-configs/besu.json
/network-configs/boot/
/network-configs/boot_enr.txt
/network-configs/boot_enr.yaml
/network-configs/bootnode.txt
/network-configs/bootstrap_nodes.txt
/network-configs/chainspec.json
/network-configs/config.yaml
/network-configs/deploy_block.txt
/network-configs/deposit_contract.txt
/network-configs/deposit_contract_block.txt
/network-configs/deposit_contract_block_hash.txt
/network-configs/genesis.json
/network-configs/genesis.ssz
/network-configs/genesis_validators_root.txt
/network-configs/mnemonics.yaml
/network-configs/parsedBeaconState.json
/network-configs/tranches/
```

previously we were using github.ref which would be main for two
different PRs making the concurrency group in valid

head_ref should work for on pull request events and that should be the
source branch

Adds PeerDAS (EIP7594) support for dory by using a [custom
image](https://github.com/ethpandaops/dora/pull/61)